NEITHER THIS DEBENTURE NOR THE SECURITIES ISSUABLE UPON CONVERSION OF
      THIS DEBENTURE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE COMMISSION
      OR THE SECURITIES COMMISSION OF ANY STATE IN RELIANCE UPON AN EXEMPTION FROM
      REGISTRATION UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES
      ACT"), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT TO AN
      EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO AN
      AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT
      AND IN ACCORDANCE WITH APPLICABLE STATE SECURITIES. THIS DEBENTURE AND THE
      SECURITIES ISSUABLE UPON CONVERSION OF THIS DEBENTURE MAY BE PLEDGED IN
      CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR OTHER LOAN SECURED BY SUCH
      SECURITIES.

Original Issue Date: December 26, 2002

$1,750,000

No. 2

MILLENNIUM CELL INC. UNSECURED CONVERTIBLE DEBENTUREDUE ON
      JUNE 26, 2003

THIS DEBENTURE is one of a series of duly
      authorized and issued debentures of Millennium Cell Inc., a corporation
      organized under the laws of the state of Delaware (the "Company"),
      designated as its Unsecured Convertible Debentures, due on June 26, 2003 in the
      aggregate principal amount of Three Million Five Hundred Thousand Dollars
      ($3,500,000) (collectively, the "Unsecured Debentures").

FOR VALUE RECEIVED, the Company promises to
      pay to the order of Pine Ridge Financial, Inc. or its registered assigns (the
      "Holder") the principal sum of One Million Seven Hundred and Fifty
      Thousand Dollars ($1,750,000) and any additional sums due pursuant to the terms
      hereof on June 26, 2003, or such earlier date as the Unsecured Debentures are
      required or permitted to be repaid hereunder ("Maturity Date"), provided, that such Maturity Date may be extended by mutual consent of the
      Company and the Holder on up to six occasions by 30 days, and to pay interest
      to the Holder on the principal amount of this Unsecured Debenture in accordance
      with the provisions hereof. This Unsecured Debenture is subject to the
      following additional provisions.

1.
           Definitions.     
      As used in this Unsecured Debenture, the following terms shall have the
      meanings set forth in this Section 1:

> "Adjustment
>         Date" means the tenth Trading Day following the Delivery Date.

> "Adjustment Notice" means a
>         written notice delivered by the Company to a Holder pursuant to Section 5(c),
>         indicating the Company's intent to adjust the Conversion Price pursuant to
>         Section 5(c).
>       "Adjustment Percentage" means, as
>         of any Adjustment Date, if the Holder shall have converted prior thereto,
>         (pursuant to Section 5(c), of the Unsecured Debentures or Section 6(c) of the
>         Secured Debentures or Exchange Debentures (as applicable)) an aggregate
>         principal amount of Debentures between: (i) $0 and $2,500,000, 88%; (ii)
>         $2,500,001 and $5,000,000, 90%; (iii) $5,000,001 and $7,500,000, 92%; (iv)
>         $7,500,001 to $10,000,000, 94%; and (v) $10,000,001 to $12,000,000, 96%.
>       "Bankruptcy Event" means any of
>         the following events: (a) the Company or any subsidiary thereof commences a
>         case or other proceeding under any bankruptcy, reorganization, arrangement,
>         adjustment of debt, relief of debtors, dissolution, insolvency or Liquidation
>         or similar law of any jurisdiction relating to the Company or any subsidiary
>         thereof; (b) there is commenced against the Company or any subsidiary thereof
>         any such case or proceeding that is not dismissed within 60 days after
>         commencement; (c) the Company or any subsidiary thereof is adjudicated
>         insolvent or bankrupt or any order of relief or other order approving any such
>         case or proceeding is entered; (d) the Company or any subsidiary thereof
>         suffers any appointment of any custodian or the like for it or any substantial
>         part of its property that is not discharged or stayed within 60 days; (e) the
>         Company or any subsidiary thereof makes a general assignment for the benefit of
>         creditors; (f) the Company or any subsidiary thereof fails to pay, or states
>         that it is unable to pay or is unable to pay, its debts generally as they
>         become due; (g) the Company or any subsidiary thereof calls a meeting of its
>         creditors with a view to arranging a composition, adjustment or restructuring
>         of its debts; or (h) the Company or any subsidiary thereof, by any act or
>         failure to act, expressly indicates its consent to, approval of or acquiescence
>         in any of the foregoing or takes any corporate or other action for the purpose
>         of effecting any of the foregoing.
>       "Business Day" means any day
>         except Saturday, Sunday and any day which shall be a federal legal holiday or a
>         day on which banking institutions in the State of New York or the State of New
>         Jersey are authorized or required by law or other governmental action to close.
>       "Change of Control" means the
>         occurrence of any of: (i) an acquisition after the date hereof by an individual
>         or legal entity or "group" (as described in Rule 13d-5(b)(1) promulgated under
>         the Exchange Act) of effective control (whether through legal or beneficial
>         ownership of capital stock of the Company, by contract or otherwise) of in
>         excess of 33% of the voting securities of the Company, (ii) a replacement at
>         one time or over time of more than one-half of the members of the Company's
>         board of directors which is not approved by a majority of those individuals who
>         are members of the board of directors on the date hereof (or by those
>         individuals who are serving as members of the board of directors on any date
>         whose nomination to the board of directors was approved by a majority of the
>         members of the board of directors who are members on the date hereof), (iii)
>         the merger of the Company with or into another entity that is not wholly-owned
>         by the Company, consolidation or sale of 50% or more of the assets of the

-2-

> Company in one or a series of related transactions, or (iv) the
>         execution by the Company of an agreement to which the Company is a party or by
>         which it is bound, providing for any of the events set forth above in (i), (ii)
>         or (iii).
>       "Closing Price" means, for any
>         date, the price determined by the first of the following clauses that applies:
>         (a) if the Common Stock is then listed or quoted on an Eligible Market, the
>         closing sales price per share of the Common Stock for such date (or the nearest
>         preceding date) on the primary Eligible Market on which the Common Stock is
>         then listed or quoted; (b) if the Common Stock is not then listed or quoted on
>         an Eligible Market and if prices for the Common Stock are then quoted on the
>         OTC Bulletin Board(or any successor thereto), the closing sales price per share
>         of the Common Stock for such date (or the nearest preceding date) on the OTC
>         Bulletin Board(or any successor thereto); (c) if the Common Stock is not then
>         listed or quoted on an Eligible Market or the OTC Bulletin Board (or any
>         successor thereto)and if prices for the Common Stock are then reported in the
>         "Pink Sheets" published by the National Quotation Bureau Incorporated (or a
>         similar organization or agency succeeding to its functions of reporting
>         prices), the most recent sales price per share of the Common Stock so reported;
>         or (d) in all other cases, the fair market value of a share of Common Stock as
>         determined by an independent appraiser selected in good faith by the Holder.
>       "Commission" means the Securities
>         and Exchange Commission.
>       "Common Stock" means the
>         Company's common stock, $.001 par value, and stock of any other class into
>         which such shares may be reclassified or changed.
>       "Common Stock Equivalents" means
>         any securities of the Company or a subsidiary thereof which entitle the holder
>         thereof to acquire Common Stock at any time, including without limitation, any
>         debt, preferred stock, rights, options, warrants or other instrument that is at
>         any time convertible into or exchangeable for, or otherwise entitles the holder
>         thereof to receive, Common Stock or other securities that entitle the holder to
>         receive, directly or indirectly, Common Stock.
>       "Company Conversion Date" means
>         the tenth (10th) day immediately following the date a Company Conversion Notice
>         together with the Conversion Schedule is delivered to the Holder pursuant to
>         Section 5(b).
>       "Company Conversion Notice" means
>         a written notice in the form attached hereto as Exhibit B.
>       "Company Prepayment Price" for
>         any Unsecured Debentures which shall be subject to prepayment pursuant to
>         Section 7(a), shall equal the sum of: (i) 110% of the principal amount of
>         Unsecured Debentures to be prepaid, plus all accrued and unpaid interest
>         thereon, and (ii) all other amounts, costs, expenses and liquidated damages due
>         in respect of such Unsecured Debentures.
>       "Conversion Date" means either a
>         Holder Conversion Date, a Company Conversion Date or an Adjustment Date.

-3-

> "Conversion Notice" means either a
>         Holder Conversion Notice or a Company Conversion Notice.
>       "Conversion Price" means the
>         Initial Conversion Price, subject to adjustment from time to time pursuant to
>         Sections 5(c) (solely with respect to conversions pursuant to Section 5(c)) and
>         5(j).
>       "Debentures" shall have the
>         meaning set forth in the Purchase Agreement.
>       "Delivery Date" means the date an
>         Adjustment Notice is delivered to the Holder pursuant to Section 5(c).
>       "Eligible Market" means any of
>         the New York Stock Exchange, the American Stock Exchange, the Nasdaq or the
>         Nasdaq Small Cap Market.
>       "Exchange Act" means the
>         Securities Exchange Act of 1934, as amended.
>       "Equity Conditions" means, with
>         respect to a specified issuance of Common Stock, that each of the following
>         conditions is satisfied: (i) the number of authorized but unissued and
>         otherwise unreserved shares of Common Stock is sufficient for such issuance;
>         (ii) such shares of Common Stock are registered for resale by the Holder
>         pursuant to an effective registration statement, and the prospectus thereunder
>         is available for use by the Holder to sell such shares or all such shares may
>         be sold without volume restrictions pursuant to Rule 144(k) under the
>         Securities Act; (iii) the Common Stock is listed or quoted (and is not
>         suspended from trading) on an Eligible Market and such shares of Common Stock
>         are approved for listing on such Eligible Market upon issuance; (iv) such
>         issuance would be permitted in full without violating Section 5(d)(i), Section
>         5(d)(ii) or the rules or regulations of the Eligible Market on which such
>         shares are listed or quoted; (v) no Event of Default nor any event that with
>         the passage of time and without being cured would constitute a Event of Default
>         has occurred and not been cured, and (vii) no public announcement of a pending
>         or proposed Change of Control transaction has occurred that has not been
>         consummated.
>       "Event of Default" means the
>         occurrence of any one of the following events (whatever the reason and whether
>         it shall be voluntary or involuntary or effected by operation of law or
>         pursuant to any judgment, decree or order of any court, or any order, rule or
>         regulation of any administrative or governmental body):
>       (i) any
>           default in the payment of principal or liquidated damages in respect of any
>           Unsecured Debentures, as and when the same becomes due and payable (whether by
>           acceleration or otherwise), or any default in the payment of interest in
>           respect of any Unsecured Debentures, within five Business Days of when the same
>           becomes due and payable;
>         (ii) a
>           Bankruptcy Event;
>         (iii)
>           the Common Stock is not listed or quoted, or is suspended from trading, on an
>           Eligible Market for an aggregate of twelve Trading Days (which need

-4-

> not be consecutive Trading Days), provided, that voluntary
>           suspensions of the Common Stock from an Eligible Market by the Company for less
>           than one hour at a time to disseminate material information shall not be
>           included within such number of Trading Days;
>         (iv) the
>           Company shall fail for any reason to deliver certificates representing
>           Underlying Shares issuable upon a conversion hereunder that comply with the
>           provisions hereof prior to the fifth Business Day after the Conversion Date or
>           the Company shall provide notice to any Holder, including by way of public
>           announcement, at any time, of its intention not to comply with requests for
>           conversion of Unsecured Debentures in accordance with the terms hereof;
>         (v) the
>           Company shall fail to have available a sufficient number of authorized and
>           unreserved shares of Common Stock to issue to such Holder upon a conversion
>           hereunder;
>         (vi) the
>           Company shall fail for any reason to pay in full the amount of cash due
>           pursuant to a Buy-In within seven days after notice therefor is delivered
>           hereunder or shall fail to pay any liquidated damages due pursuant to the
>           Transaction Documents within seven days of the date of the request for such
>           payment;
>         (vii) the
>           occurrence of a Change of Control;
>         (viii)
>           during the Effectiveness Period (as defined in the Registration Rights
>           Agreement) relating to the First Registration Statement, the effectiveness of
>           the First Registration Statement lapses for any reason or the Holder shall not
>           be permitted to resell Registrable Securities (as defined in the Registration
>           Rights Agreement) under the First Registration Statement, in either case, for
>           more than seven consecutive Trading Days or an aggregate of twenty Trading Days
>           (which need not be consecutive Trading Days);
>         (ix) the
>           Company defaults in the timely performance of any other obligation under the
>           Transaction Documents (other than in connection with the failure to issue the
>           maximum aggregate principal amount of Secured Debentures due to the inability
>           of the Company to obtain the Shareholder Approval) and such default continues
>           uncured for a period of five Trading Days after the date on which notice of
>           such default is first given to the Company by the Holder (it being understood
>           that no prior notice need be given in the case of a default that cannot
>           reasonably be cured within five Trading Days);
>         (x) an
>           Event (as defined in the Registration Rights Agreement) shall not have been
>           cured to the satisfaction of the Holder prior to the expiration of ten days
>           from the Event Date (as defined in the Registration Rights Agreement) relating
>           thereto;
>         (xi) the
>           Company or any Subsidiary defaults in any of its obligations under any other
>           debenture or any mortgage, credit agreement or other facility, indenture
>           agreement, factoring agreement or other instrument under which there may be

-5-

> issued, or by which there may be secured or evidenced, any
>           indebtedness for borrowed money or money due under any long term leasing or
>           factoring arrangement of the Company or any Subsidiary in an amount exceeding
>           $500,000, whether such indebtedness now exists or is hereafter created, and
>           such default results in such indebtedness becoming or being declared due and
>           payable prior to the date on which it would otherwise become due and payable;
>         (xii) the
>           occurrence of an Event of Default (as defined in the Debentures) under any
>           Debenture or the occurrence of any event that, with the passage of time and
>           without being cured, would constitute an Event of Default (as defined in the
>           Debentures) under any Debenture;
>         (xiii)
>           the ratio of the Company's Unsecured Cash and Cash-Equivalents balances to
>           Unsecured Indebtedness shall be less than 1.25 to 1; or
>         (xiv)
>           either: (x) the average of the Closing Prices during a 20 consecutive Trading
>           Day period shall be less than $0.75 (subject to equitable adjustment for stock
>           splits, recombinations and similar events) or (y) the average of the Closing
>           Prices during a 10 consecutive Trading Day period shall be less than $0.50
>           (subject to equitable adjustment for stock splits, recombinations and similar
>           events).
>       First Registration Statement"
>         shall have the meaning set forth in the Registration Rights Agreement.
>       "Holder Conversion Date" means
>         the date a Holder Conversion Notice together with the Conversion Schedule is
>         delivered to the Company pursuant to Section 5(a).
>       "Holder Conversion Notice" means
>         a written notice in the form attached hereto asExhibit A.
>       "Initial Conversion Price" shall
>         equal $4.25 (subject to equitable adjustment for stock splits, recombinations
>         and similar events).
>       "Interest Payment Date" means
>         each March 31, June 30, September 30 and December 31, beginning on the first
>         such date following the Original Issue Date, except if such date is not a
>         Trading Day, in which case such Interest Payment Date shall be the next
>         succeeding Trading Day.
>       "Index Price" means the average
>         of the VWAP's for the 10 consecutive Trading Days immediately following the
>         Delivery Date.
>       "Interest Rate" means 4%.
>       "Liquidation" means for any
>         Person, any liquidation, dissolution or winding-up of such Person, whether
>         voluntary or involuntary, by operation or law or otherwise.

-6-

> "Mandatory Convertible Amount"
>         means $300,000, provided, that any respect to each Adjustment Date, such
>         amount may be increased up to $2,500,000 by mutual consent of the Holder and
>         the Company reached prior to the applicable Adjustment Date.
>       "Mandatory Prepayment Amount"
>         means for any Unsecured Debentures: (I) with respect to an Event of Default
>         under clauses (i)-(xii) hereof, shall equal the sum of: (i) the greater of (A)
>         130% of the principal amount of Unsecured Debentures to be prepaid and, if
>         applicable, the Reinstated Principal, plus all accrued and unpaid interest
>         thereon, and (B) the principal amount of Unsecured Debentures to be prepaid
>         and, if applicable, the Reinstated Principal, plus all accrued and unpaid
>         interest thereon, divided by the Conversion Price on the Trading Day
>         immediately preceding (x) the date of the Event of Default or (y) the date the
>         Mandatory Prepayment Amount is paid in full, whichever is less, multiplied by
>         the Closing Price on (x) the date of the Event of Default or (y) the date the
>         Mandatory Prepayment Amount is paid in full, whichever is greater, and (ii) all
>         other amounts, costs, expenses and liquidated damages due in respect of such
>         Unsecured Debentures; (II) with respect to an Event of Default under clause
>         (xiii) hereof, shall equal the sum of: (i) 125% of the principal amount of
>         Unsecured Debentures to be prepaid, plus 125% of all accrued and unpaid
>         interest thereon and (ii) all other amounts, costs, expenses and liquidated
>         damages due in respect of such Unsecured Debentures; and (III) with respect to
>         an Event of Default under clause (xiv) hereof, shall equal the sum of: (i) the
>         principal amount of Unsecured Debentures to be prepaid, plus of all accrued and
>         unpaid interest thereon and (ii) all other amounts, costs, expenses and
>         liquidated damages due in respect of such Unsecured Debentures.
>       "Nasdaq" means the Nasdaq National
>         Market.
>       "Original Issue Date" means the
>         date of the first issuance of any Unsecured Debentures, regardless of the
>         number of transfers of any particular Unsecured Debenture and regardless of the
>         number of certificates which may be issued to evidence such Unsecured
>         Debentures.
>       "Person" means an individual or
>         corporation, partnership, trust, incorporated or unincorporated association,
>         joint venture, limited liability company, joint stock company, government (or
>         an agency or subdivision thereof) or other entity of any kind.
>       "Proceeding" means an action,
>         claim, suit, investigation or proceeding (including, without limitation, an
>         investigation or partial proceeding, such as a deposition), whether commenced
>         or threatened in writing concerning the interpretation, enforcement or defense
>         of any transaction contemplated by any Transaction Document (whether brought
>         against a party hereto or such parties affiliates, directors, officers,
>         employees or agents).
>       "Purchase Agreement" means the
>         Securities Purchase Agreement, dated as of October 31, 2002, to which the
>         Company and the original Holders are parties, as amended, modified or
>         supplemented from time to time in accordance with its terms.
>       -7-
>       "Registration Rights Agreement"
>         means the Registration Rights Agreement, dated as of October 31, 2002, to which
>         the Company and the original Holders are parties, as amended, modified or
>         supplemented from time to time in accordance with its terms.

> "Reinstated Principal" means the
>         principal amount of Unsecured Debentures converted during the ten Trading Days
>         preceding the delivery of an Event of Default Notice, for which the Company
>         issued or was obligated to issue Underlying Shares to the Holder.
>       "Secured Debentures" shall have
>         the meaning set forth in the Purchase Agreement.
>       "Securities Act" means the
>         Securities Act of 1933, as amended.
>       "Subsidiary" shall have the
>         meaning set forth in the Purchase Agreement.
>       "Trading Day" means: (a) a day on
>         which the shares of Common Stock are traded on an Eligible Market, or (b) if
>         the shares of Common Stock are not listed on an Eligible Market, a day on which
>         the shares of Common Stock are traded in the over-the-counter market, as
>         reported by the OTC Bulletin Board, or (c) if the shares of Common Stock are
>         not quoted on the OTC Bulletin Board, a day on which the shares of Common Stock
>         are quoted in the over-the-counter market as reported by the National Quotation
>         Bureau Incorporated (or any similar organization or agency succeeding its
>         functions of reporting prices); provided, that in the event that the
>         shares of Common Stock are not listed or quoted as set forth in (a), (b) and
>         (c) hereof, then Trading Day shall mean a Business Day.
>       "Transaction Documents" shall
>         have the meaning set forth in the Purchase Agreement.
>       "Underlying Shares" means,
>         collectively, the shares of Common Stock issuable upon conversion of Unsecured
>         Debentures in accordance with the terms hereof.
>       "Unsecured Cash and Cash
>         Equivalents" refers to cash and cash-equivalent balances that is not
>         pledged to collateralize the Letter of Credit (as defined in the Purchase
>         Agreement), if any, or otherwise available for use by the Company in its
>         operations, excluding the deferred royalty income described in Schedule
>         3.1(x) to the Purchase Agreement.
>       "Unsecured Indebtedness" means
>         any indebtedness of the Company, excluding any Secured Debentures, any other
>         similar outstanding secured debentures of the Company issued to Ballard Power
>         Systems, Inc. and any outstanding deferred royalty income described in
>         Schedule 3.1(x) to the Purchase Agreement.
>       "VWAP" means on any particular
>         Trading Day or for any particular period, the volume weighted average trading
>         price per share of Common Stock on such date or for such period on an Eligible
>         Market as reported by Bloomberg L.P., or any successor performing similar
>         functions.

-8-

> "Warrants" shall have the meaning
>         set forth in the Purchase Agreement.

2.     
      Interest.

(a)      The Company shall pay interest to the Holder
      on the aggregate unconverted and then outstanding principal amount of this
      Unsecured Debenture (including any interest added to such principal in
      accordance with this Section 2) at an annual rate equal to the Interest Rate,
      payable quarterly in arrears on each Interest Payment Date. Interest shall be
      calculated on the basis of a 360-day year and shall accrue daily commencing on
      the Original Issue Date. Subject to the conditions and limitations set forth
      below, the Company will pay interest under this Unsecured Debenture either (i)
      in cash, or (ii) by delivering by the third Trading Day following the Interest
      Payment Date, a number of freely tradable shares of Common Stock equal to the
      quotient obtained by dividing the amount of such interest by the arithmetic
      average of the VWAP for the five Trading Days immediately preceding (but not
      including) the Interest Payment Date. To pay the interest payable on an
      Interest Payment Date in freely tradable shares of Common Stock, the Company
      must deliver written notice to the Holder indicating its election to make such
      stock payment at least 20 calendar days prior to such Interest Payment Date,
      but the Company may indicate in any such notice that the election contained
      therein shall continue for subsequent Interest Payment Dates until revised on
      not less than 20 calendar days notice prior to an Interest Payment Date.
      Failure to timely provide such written notice shall be deemed an election by
      the Company to pay such interest in cash. All interest payable on any Interest
      Payment Date must be paid in the same manner.

(b)
           Notwithstanding the foregoing, the Company may
      not pay interest in shares of Common Stock unless, on the Interest Payment
      Date, the Equity Conditions are satisfied with respect to all of the Underlying
      Shares then issuable upon conversion in full of all outstanding Unsecured
      Debentures. If the Company is required but fails to pay interest in cash on any
      Interest Payment Date, the Holder may (but shall not be required to), by notice
      to the Company, treat such interest as if it had been accreted to the principal
      amount of this Unsecured Debenture as of such Interest Payment Date.

3.
           Registration of Unsecured Debentures. The
      Company shall register the Unsecured Debentures upon records to be maintained
      by the Company for that purpose (the "Unsecured Debenture Register") in
      the name of each record holder thereof from time to time. The Company may deem
      and treat the registered Holder as the absolute owner hereof for the purpose of
      any conversion hereof or any payment of interest hereon, and for all other
      purposes, absent actual notice to the contrary.

4.
           Registration of Transfers and Exchanges.
           The Company shall register the transfer of any
      portion of this Unsecured Debenture in the Unsecured Debenture Register upon
      surrender of this Unsecured Debenture to the Company at its address for notice
      set forth herein. Upon any such registration or transfer, a new debenture, in
      substantially the form of this Unsecured Debenture (any such new debenture, a
      "New Unsecured Debenture"), evidencing the portion of this Unsecured
      Debenture so transferred shall be issued to the transferee and a New Unsecured
      Debenture evidencing the remaining portion of this Unsecured Debenture not so
      transferred, if any, shall be issued to the transferring Holder. The acceptance
      of the New

-9-

Unsecured Debenture by the transferee thereof shall be deemed the
      acceptance by such transferee of all of the rights and obligations of a holder
      of a Unsecured Debenture. This Unsecured Debenture is exchangeable for an equal
      aggregate principal amount of Unsecured Debentures of different authorized
      denominations, as requested by the Holder surrendering the same. No service
      charge or other fee will be imposed in connection with any such registration of
      transfer or exchange. Transfers of this Unsecured Debenture and the Underlying
      Shares issuable on conversion thereof hereby are governed by Section 4.1 of the
      Purchase Agreement.

5.
           Conversion

(a)     
      At the option of the Holder. The principal amount of this Unsecured
      Debenture then outstanding is convertible into shares of Common Stock at the
      Conversion Price (subject to limitations set forth in Section 5(d)), at the
      option of the Holder, at any time and from time to time from and after the
      Original Issue Date. Holders shall effect conversions under this Section 5(a),
      by delivering to the Company a Holder Conversion Notice together with a
      schedule in the form of Schedule 1 attached hereto (the "Conversion
      Schedule"). The number of Underlying Shares issuable upon any conversion
      hereunder shall (subject to limitations set forth in Section 5(d)) equal the
      outstanding principal amount of this Unsecured Debenture to be converted
      divided by the Initial Conversion Price. If the Holder is converting less than
      all of the principal amount represented by this Unsecured Debenture, or if a
      conversion hereunder may not be effected in full due to the application of
      Section 5(d)(i), the Company shall honor such conversion to the extent
      permissible hereunder and shall promptly deliver to the Holder a Conversion
      Schedule indicating the principal amount which has not been converted.

(b)
           At the option of the Company. Subject to
      the conditions set forth in this Section 5(b) and Section 5(d), at any time
      after the first year anniversary of the Original Issue Date, the Company may
      require a conversion of principal amount of this Unsecured Debenture, at the
      Conversion Price and on the Company Conversion Date, of all or a portion of the
      outstanding principal amount of this Unsecured Debenture if: (i) both: (A) the
      average of the Closing Prices during any 30 consecutive Trading Days is equal
      to or greater than $5.10 (subject to equitable adjustments for stock splits,
      recapitalizations and similar events) and (B) the Closing Price for each of 15
      Trading Days (which need not be consecutive) during such 30 consecutive Trading
      Day period is equal to or greater than $5.10 (subject to equitable adjustments
      for stock splits, recapitalizations and similar events) and (ii) all of the
      Equity Conditions are satisfied as of the Company Conversion Date with respect
      to all of the Underlying Shares potentially issuable in connection with such
      proposed conversion. The Company shall exercise its right to require
      conversions hereunder by delivering to the Holder a Company Conversion Notice
      together with a Conversion Schedule within 10 Business Days of the satisfaction
      of the condition set forth in clause (i) of the immediately preceding sentence.
      Notwithstanding anything herein to the contrary, if any of the conditions set
      forth in clauses (i) and (ii) herein shall cease to be in effect during the
      period between the date of the delivery of the Company Conversion Notice and
      the Company Conversion Date, then the Holder subject to such conversion may
      elect, by written notice to the Company given at any time after any such
      conditions shall cease to be in effect, to invalidate ab initio such
      conversion. The number of Underlying Shares issuable upon any conversion
      hereunder shall (subject to limitations set forth in Section 5(d)) equal the
      outstanding principal amount of this Unsecured Debenture to be converted
      (including any interest payments

-10-

accreted to principal pursuant to the terms hereof) divided by the
      Conversion Price. The conversion subject to each Company Conversion Notice,
      once given, shall be irrevocable as to the Company. If the conversion of a
      principal amount of Unsecured Debentures indicated in a Company Conversion
      Notice would result in the issuance to the Holder of Underlying Shares in
      excess of the amount permitted pursuant to Section 5(d)(i), the Holder shall
      notify the Company of this fact and the Company shall: (x) honor the conversion
      for the maximum principal amount of Unsecured Debentures permitted, pursuant to
      Section 5(d)(i), to be converted on such Company Conversion Date and (y) cancel
      the Company Conversion Notice with respect to the portion of the principal
      amount of Unsecured Debentures the conversion of which would violate Section
      5(d)(i). Notwithstanding anything herein to the contrary, the Company shall not
      be entitled to deliver a Company Conversion Notice prior to the 10th
      Business Day following the delivery of a company conversion notice pursuant to
      any Debenture.

(c)
           Company's option to adjust Conversion Price
      and force conversion. At any time and from time to time after the date the
      First Registration Statement has been declared effective by the Commission, the
      Company shall have the option, upon the delivery of an Adjustment Notice to the
      Holder, to adjust the Conversion Price then in effect with respect to the
      Mandatory Convertible Amount applicable to such Adjustment Notice to equal the
      lesser of: (A) the Initial Conversion Price and (B) the product of (x) the
      applicable Adjustment Percentage and (y) the Index Price. Subject to the terms
      hereof (including, without limitation, Section 5(d)(i)), on each Adjustment
      Date immediately following the delivery of an Adjustment Notice, the applicable
      Mandatory Convertible Amount shall be converted into Underlying Shares at the
      Conversion Price as adjusted on such Adjustment Date pursuant to the terms of
      the immediately preceding sentence, provided, that such conversion shall
      only occur if all of the Equity Conditions are satisfied as of the Adjustment
      Date with respect to all of the Underlying Shares potentially issuable in
      connection with such proposed conversion. Notwithstanding anything herein to
      the contrary, the Company shall not be entitled to deliver an Adjustment Notice
      prior to the tenth (10th) Trading Day immediately following the
      immediately preceding Delivery Date hereunder or a delivery date under any
      Debenture. If a conversion of the Mandatory Convertible Amount would result in
      the issuance to the Holder of Underlying Shares in excess of the amount
      permitted pursuant to Section 5(d)(i), the Holder shall notify the Company of
      this fact and the Company shall: (x) honor the conversion for the maximum
      principal amount of Unsecured Debentures permitted, pursuant to Section
      5(d)(i), to be converted on the applicable Adjustment Date and (y) cancel the
      portion of the Mandatory Convertible Amount the conversion of which would
      violate Section 5(d)(i).

(d)
           Certain Conversion Restrictions.

(i)
           Notwithstanding anything to the contrary
      contained herein, the number of shares of Common Stock that may be acquired by
      a Holder upon any conversion of Unsecured Debentures (or otherwise in respect
      hereof) shall be limited to the extent necessary to insure that, following such
      conversion (or other issuance), the total number of shares of Common Stock then
      beneficially owned by such Holder and its affiliates and any other Persons
      whose beneficial ownership of Common Stock would be aggregated with such
      Holder's for purposes of Section 13(d) of the Exchange Act, does not exceed
      9.999% of the total number of issued and outstanding shares of Common Stock
      (including for such purpose the shares of Common Stock issuable upon such
      conversion). For such purposes, beneficial ownership shall be

-11-

determined in accordance with Section 13(d) of the Exchange Act and the
      rules and regulations promulgated thereunder. Each delivery of a Holder
      Conversion Notice hereunder will constitute a representation by the applicable
      Holder that it has evaluated the limitation set forth in this paragraph and
      determined that issuance of the full number of Underlying Shares issuable in
      respect of such Conversion Notice does not violate the restriction contained in
      this paragraph. This provision shall not restrict the number of shares of
      Common Stock which a Holder may receive or beneficially own in order to
      determine the amount of securities or other consideration that such Holder may
      receive in the event of a merger, sale or other business combination or
      reclassification involving the Company as contemplated herein.

(ii)
           If the Company has not previously obtained
      Shareholder Approval (as defined below), then the Company may not issue in
      excess of the Issuable Maximum upon conversions of the Unsecured Debentures.
      The "Issuable Maximum" means a number of shares equal to 2,973,847,
      less: any number of shares of Common Stock previously issued upon conversion of
      any Debenture and exercise of any Warrants. Each Holder shall be entitled to a
      portion of the Issuable Maximum equal to the quotient obtained by dividing: (x)
      the principal amount of Unsecured Debentures issued and sold to such Holder on
      the Original Issue Date by (y) the aggregate principal amount of Unsecured
      Debentures issued and sold by the Company on the Original Issue Date. If any
      Holder shall no longer hold Unsecured Debentures, then such Holder's remaining
      portion of the Issuable Maximum shall be allocated pro-rata among the remaining
      Holders. If on any Conversion Date: (A) the aggregate number of shares of
      Common Stock that would then be issuable upon conversion in full of all then
      outstanding principal amount of Unsecured Debentures would exceed the Issuable
      Maximum, and (B) the Company shall not have previously obtained the vote of
      shareholders, as may be required by the applicable rules and regulations of the
      Nasdaq (or any successor entity) applicable to approve the issuance of shares
      of Common Stock in excess of the Issuable Maximum pursuant to the terms hereof
      (the "Shareholder Approval"), then, the Company shall issue to the
      converting Holder a number of shares of Common Stock equal to such Holder's
      pro-rata portion (which shall be calculated pursuant to the terms hereof) of
      the Issuable Maximum and, with respect to the remainder of the principal amount
      of Unsecured Debentures then held by such Holder for which a conversion would
      result in an issuance of shares of Common Stock in excess of such Holder's
      pro-rata portion (which shall be calculated pursuant to the terms hereof) of
      the Issuable Maximum (the "Excess Principal Amount"), the applicable
      Holder shall have the right to require the Company to either: (1) obtain the
      Shareholder Approval applicable to such issuance as soon as is possible, but in
      any event not later than the 90th day after such request, or (2) pay cash, in
      an amount equal to the Excess Principal Amount (and accrued and unpaid interest
      thereon). If a Holder shall have elected the first option pursuant to the
      immediately preceding sentence and the Company shall have failed to obtain the
      Shareholder Approval on or prior to the 90th day after such request, then
      within three (3) days of such 90th day, the Company shall pay cash to such
      Holder an amount equal to Excess Principal Amount (and accrued and unpaid
      interest thereon). Notwithstanding anything herein to the contrary, if on any
      date other than a Conversion Date: (A) the aggregate number of shares of Common
      Stock that would then be issuable upon conversion in full of all then
      outstanding principal amount of Unsecured Debentures would exceed the Issuable
      Maximum, and (B) the Company shall not have previously obtained the Shareholder
      Approval, then, the Holder shall be entitled to require the Company to pay to
      it in cash an amount equal to the principal amount of Unsecured Debentures (and
      accrued and unpaid interest thereon) then held by such Holder for which a
      potential

-12-

conversion on such date would result in an issuance of shares of Common
      Stock in excess of such Holder's pro-rata portion (which shall be calculated
      pursuant to the terms hereof) of the Issuable Maximum. The outstanding
      principal amount of Unsecured Debentures shall be reduced by the Excess
      Principal Amount upon the Holder's receipt of the Excess Principal Amount
      pursuant to the terms hereof. The Company and the Holder understand and agree
      that shares of Common Stock issued to and then held by the Holder as a result
      of conversions of Unsecured Debentures shall not be entitled to cast votes on
      any resolution to obtain Shareholder Approval pursuant hereto.

(e)
           Mechanics of Conversion. By the third
      Trading Day after each Conversion Date, the Company shall issue or cause to be
      issued and cause to be delivered to or upon the written order of the Holder and
      in such name or names as the Holder may designate a certificate for the
      Underlying Shares issuable upon such conversion which, unless required by the
      Purchase Agreement, shall be free of all restrictive legends. The Holder, or
      any Person so designated by the Holder to receive Underlying Shares, shall be
      deemed to have become the holder of record of such Underlying Shares as of the
      Conversion Date. If the Company's transfer agent is eligible to participate in
      the Depositary Trust Corporation DWAC system and no legends are required to be
      included on the certificates representing Underlying Shares pursuant to the
      Purchase Agreement, the Company shall, upon request of the Holder, use its best
      efforts to deliver Underlying Shares hereunder electronically through the
      Depository Trust Corporation or another established clearing corporation
      performing similar functions.

(f)
           To effect conversions hereunder, the Holder shall
      not be required to physically surrender this Unsecured Debenture unless the
      aggregate principal amount represented by such Unsecured Debenture is being
      converted, in which event, the Holder shall deliver such Unsecured Debenture
      promptly to the Company (it being understood that such delivery is not a
      condition precedent to the Company's obligations to deliver Underlying Shares
      upon such conversion). Conversions hereunder shall have the effect of lowering
      the outstanding principal amount represented by such Unsecured Debenture in an
      amount equal to the applicable conversion, which shall be evidenced by entries
      set forth in the Conversion Schedule which will be maintained by the Company
      and the Holder and be binding on both parties absent manifest error.

(g)
           The Company's obligations to issue and deliver
      Underlying Shares upon conversion of this Unsecured Debenture in accordance
      with the terms hereof (including, without limitations, Section 5(d)) are
      absolute and unconditional, irrespective of any action or inaction by the
      Holder to enforce the same, any waiver or consent with respect to any provision
      hereof, the recovery of any judgment against any Person or any action to
      enforce the same, or any setoff, counterclaim, recoupment, limitation or
      termination, or any breach or alleged breach by the Holder or any other Person
      of any obligation to the Company or any violation or alleged violation of law
      by the Holder or any other Person, and irrespective of any other circumstance
      which might otherwise limit such obligation of the Company to the Holder in
      connection with the issuance of such Underlying Shares.

(h)
           If by the third Trading Day after a Conversion
      Date the Company fails to deliver to the Holder such Underlying Shares in such
      amounts and in the manner required pursuant to Section 5(e), then the Holder
      will have the right to rescind such conversion.

-13-

(i)
           If by the third Trading Day after a Conversion
      Date the Company fails to deliver to the Holder such Underlying Shares in such
      amounts and in the manner required pursuant to Section 5(e), and if after such
      third Trading Day the Holder purchases (in an open market transaction or
      otherwise) shares of Common Stock to deliver in satisfaction of a sale by such
      Holder of the Underlying Shares which the Holder anticipated receiving upon
      such conversion (a "Buy-In"), then the Company shall (A) pay in cash to
      the Holder (in addition to any remedies available to or elected by the Holder)
      the amount by which (x) the Holder's total purchase price (including brokerage
      commissions, if any) for the shares of Common Stock so purchased exceeds (y)
      the amount obtained by multiplying (1) the aggregate number of Underlying
      Shares that the Company was required to deliver to the Holder in connection
      with the conversion at issue by (2) the Closing Price at the time of the
      obligation giving rise to such purchase obligation and (B) at the option of the
      Holder, either reinstate the principal amount of Unsecured Debentures and
      equivalent number of Underlying Shares for which such conversion was not timely
      honored or deliver to the Holder the number of shares of Common Stock that
      would have been issued had the Company timely complied with its conversion and
      delivery obligations hereunder. For example, if the Holder purchases Common
      Stock having a total purchase price of $11,000 to cover a Buy-In with respect
      to an attempted conversion of Unsecured Debentures with a market price on the
      date of conversion totaling $10,000, under clause (A) of the immediately
      preceding sentence, the Company shall be required to pay the Holder $1,000. The
      Holder shall provide the Company written notice indicating the amounts payable
      to the Holder in respect of the Buy-In.

(j)
           Adjustments to Conversion Price. The
      Conversion Price in effect on any Conversion Date shall be subject to
      adjustments in accordance with this Section 5(j):

(i)      Stock Dividends and Splits. If the
      Company, at any time while any Unsecured Debentures are outstanding, (i) pays a
      stock dividend on its Common Stock or otherwise makes a distribution on any
      class of capital stock that is payable in shares of Common Stock, (ii)
      subdivides outstanding shares of Common Stock into a larger number of shares,
      or (iii) combines outstanding shares of Common Stock into a smaller number of
      shares, then in each such case the Conversion Price shall be multiplied by a
      fraction of which the numerator shall be the number of shares of Common Stock
      outstanding immediately before such event and of which the denominator shall be
      the number of shares of Common Stock outstanding immediately after such event.
      Any adjustment made pursuant to clause (i) of this paragraph shall become
      effective immediately after the record date for the determination of
      stockholders entitled to receive such dividend or distribution, and any
      adjustment pursuant to clause (ii) or (iii) of this paragraph shall become
      effective immediately after the effective date of such subdivision or
      combination.

(ii)
           Additional Distributions. If the Company,
      at any time while any Unsecured Debentures are outstanding, shall distribute to
      all holders of Common Stock (and not to Holders) evidences of its indebtedness
      or assets or rights or warrants to subscribe for or purchase any security, then
      in each such case the Conversion Price at which the principal amount of
      Unsecured Debentures shall thereafter be convertible shall be determined by
      multiplying the Conversion Price in effect immediately prior to the record date
      fixed for determination of stockholders entitled to receive such distribution
      by a fraction of which the denominator shall be the Closing Price determined as
      of the record date mentioned above, and of

-14-

which the numerator shall be such Closing Price on such record date less
      the then fair market value at such record date of the portion of such assets or
      evidence of indebtedness so distributed applicable to one outstanding share of
      Common Stock as determined by the Board of Directors in good faith. In either
      case the adjustments shall be described in a statement provided to the Holders
      of the portion of assets or evidences of indebtedness so distributed or such
      subscription rights applicable to one share of Common Stock. Such adjustment
      shall be made whenever any such distribution is made and shall become effective
      immediately after the record date mentioned above.

(iii)      Subsequent Equity Sales. If the
      Company or any subsidiary thereof, as applicable, at any time while this
      Unsecured Debenture is outstanding, shall issue shares of Common Stock or
      Common Stock Equivalents entitling any Person to acquire shares of Common
      Stock, at a price per share less than the Conversion Price (if the holder of
      the Common Stock or Common Stock Equivalent so issued shall at any time,
      whether by operation of purchase price adjustments, reset provisions, floating
      conversion, exercise or exchange prices or otherwise, or due to warrants,
      options or rights issued in connection with such issuance, be entitled to
      receive shares of Common Stock at a price less than the Conversion Price, such
      issuance shall be deemed to have occurred for less than the Conversion Price),
      then, at the option of the Holder for such conversions as it shall indicate,
      the Conversion Price shall be adjusted to mirror the conversion, exchange or
      purchase price for such Common Stock or Common Stock Equivalents (including any
      reset provisions thereof) at issue. Such adjustment shall be made whenever such
      Common Stock or Common Stock Equivalents are issued. The Company shall notify
      the Holder in writing, no later than the Trading Day following the issuance of
      any Common Stock or Common Stock Equivalent subject to this section, indicating
      therein the applicable issuance price, or of applicable reset price, exchange
      price, conversion price and other pricing terms. No further adjustments shall
      be made to the Conversion Price upon the actual issuance of Common Stock upon
      conversion or exercise of the applicable Common Stock Equivalent.
      Notwithstanding the foregoing, no adjustment will be made under this Section
      5(j)(iii) in respect of:

(A)
           Any grant of an option or warrant for Common
      Stock or issuance of any shares of Common Stock upon the exercise of any
      options or warrants to employees, officers and directors of or consultants to
      the Company pursuant to any stock option plan, employeestock purchase plan or
      similar plan or incentive or consulting arrangement approved by the Company's
      board of directors;

(B)
           Any rights or agreements to purchase Common Stock
      Equivalents outstanding on the date hereof and as specified in Schedule 3.1(g)
      to the Purchase Agreement (but not as to any amendments or other modifications
      to the number of Common Stock issuable thereunder, the terms set forth therein,
      or the exercise price set forth therein);

(C)
           Any Common Stock or Common Stock Equivalents
      issued for consideration other than cash pursuant to a merger, consolidation,
      acquisition or other similar business combination;

(D)      Any issuances of Common Stock or Common Stock

-15-

Equivalents to a Person which is or will be, itself or through its
      subsidiaries, an operating company in a business related to or complementary
      with the business of the Company and in which the Company receives reasonably
      material benefits in addition to the investment of funds, but shall not include
      a transaction in which the Company is issuing securities primarily for the
      purpose of raising capital or to an entity whose primary business is investing
      in securities;

(E)      Any Common Stock Equivalents that entitle the
      holders thereof to acquire up to 500,000 shares of Common Stock issued pursuant
      to any equipment leasing arrangement;

(F)      Any Common Stock or Common Stock Equivalents
      issued to pay all or a portion of any investment banking, finders or similar
      fee or commission, which entitles the holders thereof to acquire shares of
      Common Stock at a price not less than the market price of the Common Stock on
      the date of such issuance and which is not subject to any adjustments other
      than on account of stock splits and reverse stock splits;

(G)      A bona fide underwritten public offering of
      the Common Stock resulting in gross proceeds in excess of $15 million to the
      Company (it being understood that equity line transactions, including any on
      going warrant financing, or any similar arrangements shall not constitute a
      bona fide underwritten public offering of the Common Stock for the purposes
      hereof);

(H)      Any adjustment to the Conversion Price
      pursuant to Section 5(c); or

(I)
           The issuance of any Debentures or Warrants
      pursuant to the Purchase Agreement or the issuance of any shares of Common
      Stock upon conversion and exercise, respectively, of Debentures and Warrants or
      upon exercise of warrants issued by the Company on June 19, 2002 to Pine Ridge
      Financial, Inc. and ZLP Master Technology Fund, Ltd.

(iv)      Calculations. All calculations under
      this Section 5(j) shall be made to the nearest cent or the nearest 1/100th of a
      share, as the case may be. The number of shares of Common Stock outstanding at
      any given time shall not include shares owned or held by or for the account of
      the Company, and the disposition of any such shares shall be considered an
      issue or sale of Common Stock.

(v)
           Notice of Adjustments. Whenever the
      Conversion Price is adjusted pursuant to the terms hereof the Company shall
      promptly mail to each Holder, a notice setting forth the Conversion Price after
      such adjustment and setting forth a brief statement of the facts requiring such
      adjustment.

(k)
           Fundamental Transactions. If, at any time
      while this Unsecured Debenture is outstanding: (i) the Company effects any
      merger or consolidation of the Company with or into another Person, (ii) the
      Company effects any sale of all or substantially all of its assets in one or a
      series of related transactions, (iii) any tender offer or exchange offer
      (whether by the Company or another Person) is completed pursuant to which
      holders of Common Stock are permitted to tender or exchange their shares for
      other securities, cash or property, or (iv) the

-16-

Company effects any reclassification of the Common Stock or any
      compulsory share exchange pursuant to which the Common Stock is effectively
      converted into or exchanged for other securities, cash or property (in any such
      case, a "Fundamental Transaction"), then the Holder shall have the right
      thereafter to receive, upon conversion of the outstanding principal amount of
      this Unsecured Debenture, the same amount and kind of securities, cash or
      property as it would have been entitled to receive upon the occurrence of such
      Fundamental Transaction if it had been, immediately prior to such Fundamental
      Transaction, the holder of the number of Underlying Shares then issuable upon
      conversion in full of the outstanding principal amount of this Unsecured
      Debenture (the "Alternate Consideration"). For purposes of any such
      exercise, the determination of the Conversion Price shall be appropriately
      adjusted to apply to such Alternate Consideration based on the amount of
      Alternate Consideration issuable in respect of one share of Common Stock in
      such Fundamental Transaction, and the Company shall apportion the Conversion
      Price among the Alternate Consideration in a reasonable manner reflecting the
      relative value of any different components of the Alternate Consideration. If
      holders of Common Stock are given any choice as to the securities, cash or
      property to be received in a Fundamental Transaction, then the Holder shall be
      given the same choice as to the Alternate Consideration it receives upon any
      conversion of the outstanding principal amount of this Unsecured Debenture
      following such Fundamental Transaction. At the Holder's option and request, any
      successor to the Company or surviving entity in such Fundamental Transaction
      shall, either (i) issue to the Holder a new debenture substantially in the form
      of this Unsecured Debenture and consistent with the foregoing provisions
      (omitting Section 5(j)(iii) hereof) and evidencing the Holder's right to
      purchase the Alternate Consideration at the Conversion Price upon conversion
      thereof, or (ii) purchase the Unsecured Debenture from the Holder for a
      purchase price, payable in cash within five Trading Days after such request
      (or, if later, on the effective date of the Fundamental Transaction), equal to
      the Black Scholes value of the remaining unconverted portion of the outstanding
      principal amount of this Unsecured Debenture (together with any accrued but
      unpaid interest thereon) on the date of the Fundamental Transaction as well as
      assumptions reasonably mutually acceptable to the Company and the Holder,
      provided that for purposes of such calculation, the market price of the Common
      Stock shall be the closing bid price of the Common Stock on the Trading Day
      immediately preceding the public announcement of the Fundamental Transaction
      and the volatility factor shall be determined by reference to the 12 month
      average industry volatility measures. The terms of any agreement pursuant to
      which a Fundamental Transaction is effected shall include terms requiring any
      such successor or surviving entity to comply with the provisions of this
      paragraph (k) and insuring that the Unsecured Debenture (or any such
      replacement security) will be similarly adjusted upon any subsequent
      transaction analogous to a Fundamental Transaction.

(l)
           Reclassifications; Share Exchanges. In
      case of any reclassification of the Common Stock, or any compulsory share
      exchange pursuant to which the Common Stock is converted into other securities,
      cash or property (other than compulsory share exchanges which constitute Change
      of Control Transactions), the Holders of the Unsecured Debentures then
      outstanding shall have the right thereafter to convert such shares only into
      the shares of stock and other securities, cash and property receivable upon or
      deemed to be held by holders of Common Stock following such reclassification or
      share exchange, and the Holders shall be entitled upon such event to receive
      such amount of securities, cash or property as a holder of the number of shares
      of Common Stock of the Company into which such shares of Unsecured Debentures
      could have been converted immediately prior to such reclassification or share
      exchange would have

-17-

been entitled. This provision shall similarly apply to successive
      reclassifications or share exchanges.

(m)
           Notice of Corporate Events. If (a) the
      Company shall declare a dividend (or any other distribution) on the Common
      Stock, (b) the Company shall declare a special nonrecurring cash dividend on or
      a redemption of the Common Stock, (c) the Company shall authorize the granting
      to all holders of Common Stock rights or warrants to subscribe for or purchase
      any shares of capital stock of any class or of any rights, (d) the approval of
      any stockholders of the Company shall be required in connection with any Change
      of Control transaction or Fundamental Transaction, (e) the entering into an
      agreement to effectuate a Change of Control transaction or Fundamental
      Transaction, or (f) the Company shall authorize the Liquidation of the Company;
      then the Company shall file a press release or Current Report on Form 8-K to
      disclose such occurrence and notify the Holders at their last addresses as they
      shall appear upon the stock books of the Company, at least 20 calendar days
      prior to the applicable record or effective date hereinafter specified, a
      notice stating (x) the date on which a record is to be taken for the purpose of
      such dividend, distribution, redemption, rights or warrants, or if a record is
      not to be taken, the date as of which the holders of Common Stock of record to
      be entitled to such dividend, distributions, redemption, rights or warrants are
      to be determined or (y) the date on which any such Change of Control
      transaction or Fundamental Transaction is expected to become effective or
      close, and the date as of which it is expected that holders of Common Stock of
      record shall be entitled to exchange their Common Stock for securities, cash or
      other property deliverable upon any such Change of Control Transaction or
      Fundamental Transaction. Holders are entitled to convert principal amount of
      this Unsecured Debenture during the 20-day period commencing the date of such
      notice to the effective date of the event triggering such notice.

(n)
           The Company covenants that it will at all times
      reserve and keep available out of its authorized and unissued shares of Common
      Stock solely for the purpose of issuance upon conversion of Unsecured
      Debentures, each as herein provided, free from preemptive rights or any other
      actual contingent purchase rights of persons other than the Holders, not less
      than such number of shares of Common Stock as shall be issuable upon the
      conversion of all outstanding principal amount of Unsecured Debentures. The
      Company covenants that all shares of Common Stock that shall be so issuable
      shall, upon issue, be duly and validly authorized and issued and fully paid and
      nonassessable.

(o)
           Upon a conversion hereunder the Company shall not
      be required to issue stock certificates representing fractions of shares of
      Common Stock, but may if otherwise permitted, make a cash payment in respect of
      any final fraction of a share based on the Closing Price on the applicable
      Conversion Date. If any fraction of an Underlying Share would, except for the
      provisions of this Section 5(o), be issuable upon a conversion hereunder, the
      Company shall pay an amount in cash equal to the Conversion Price multiplied by
      such fraction.

(p)
           The issuance of certificates for Common Stock on
      conversion of principal amount of this Unsecured Debenture shall be made
      without charge to the Holders thereof for any documentary stamp or similar
      taxes that may be payable in respect of the issue or delivery of such
      certificate, provided that the Company shall not be required to pay any tax
      that may be payable in respect of any transfer involved in the issuance and
      delivery of any such

-18-

certificate upon conversion in a name other than that of the Holder of
      such Unsecured Debentures so converted.

(q)
           Any and all notices or other communications or
      deliveries to be provided by the Holders, including, without limitation, any
      Conversion Notice, shall be in writing and delivered personally, by facsimile
      or sent by a nationally recognized overnight courier service, addressed to the
      attention of the Chief Financial Officer of the Company addressed to 1
      Industrial Way West, Eatontown, New Jersey, Facsimile No.: (732) 542-4010, or
      to such other address or facsimile number as shall be specified in writing by
      the Company for such purpose. Any and all notices or other communications or
      deliveries to be provided by the Company hereunder shall be in writing and
      delivered personally, by facsimile or sent by a nationally recognized overnight
      courier service, addressed to each Holder at the facsimile telephone number or
      address of such Holder appearing on the books of the Company, or if no such
      facsimile telephone number or address appears, at the principal place of
      business of the Holder. Any notice or other communication or deliveries
      hereunder shall be deemed given and effective on the earliest of (i) the date
      of transmission, if such notice or communication is delivered via facsimile at
      the facsimile telephone number specified in this Section 5(q) prior to 6:30
      p.m. (New York City time)(with confirmation of transmission), (ii) the date
      after the date of transmission, if such notice or communication is delivered
      via facsimile at the facsimile telephone number specified in this Section 5(q)
      later than 6:30 p.m. (New York City time) on any date and earlier than 11:59
      p.m. (New York City time) on such date (with confirmation of transmission),
      (iii) upon receipt, if sent by a nationally recognized overnight courier
      service, or (iv) upon actual receipt by the party to whom such notice is
      required to be given.

6.
           Prepayments Upon Events of Default. Upon
      the occurrence of an Event of Default, each Holder shall (in addition to all
      other rights it may have hereunder or under applicable law), have the right
      exercisable at the sole option of such Holder, and by delivery of a written
      notice to the Company to require the Company (an "Event of Default
      Notice"), to prepay all or a portion of the Unsecured Debentures then held
      by such Holder and, at the option of the Holder, all or a portion of the
      Reinstated Principal, for an amount, in cash, equal to the Mandatory Prepayment
      Amount. The Mandatory Prepayment Amount shall be due and payable within five
      Trading Days of the date of the Event of Default Notice. For purposes of this
      Section 6 principal amount of Unsecured Debentures shall remain outstanding
      until such date as the Holder shall have received Underlying Shares upon a
      conversion (or attempted conversion) thereof that meets the requirements
      hereof. Notwithstanding anything herein to the contrary, upon the occurrence of
      a Bankruptcy Event, all outstanding principal and accrued but unpaid interest
      on this Unsecured Debenture shall immediately become due and payable in full in
      cash, without any further action by the Holder, and the Company shall
      immediately be obligated to pay the Mandatory Prepayment Amount pursuant to
      this paragraph as if the Holder had delivered a Event of Default Notice
      immediately prior to the occurrence of any such Event of Default. The Holder
      need not provide and the Company hereby waives any presentment, demand, protest
      or other notice of any kind, and the Holder may immediately and without
      expiration of any grace period enforce any and all of its rights and remedies
      hereunder and all other remedies available to it under applicable law. Such
      declaration may be rescinded and annulled by Holder at any time prior to
      payment hereunder. No such rescission or annulment shall affect any subsequent
      Event of Default or impair any right consequent thereon.

-19-

7.
           Prepayment at the Option of the Company.

(a)
           At any time following the Original Issue Date and
      prior to the Maturity Date, upon delivery of a written notice to the Holder (a
      "Company Prepayment Notice" and the date such notice is delivered by the
      Company, the "Company Notice Date"), the Company shall be entitled to
      prepay a principal amount of Unsecured Debentures equal to the lesser of (x)
      the aggregate outstanding principal amount of Unsecured Debentures then held by
      the Holder and (y) the principal amount of Unsecured Debentures which may be
      converted without violation of Section 5(d)(i), in either case, for an amount
      in cash equal to the Company Prepayment Price. Notwithstanding anything herein
      to the contrary, the Company shall only be entitled to deliver a Company
      Prepayment Notice pursuant to the terms hereof if the Equity Conditions are
      satisfied with respect to all shares of Common Stock issuable upon a Company
      Notice Date. If any of Equity Conditions shall cease to be in effect during the
      period between the Company Notice Date and the date the Company Prepayment
      Price is paid in full, then the Holder subject to such prepayment may elect, by
      written notice to the Company given at any time after any of the Equity
      Conditions shall cease to be in effect, to invalidate ab initio such
      optional prepayment, notwithstanding anything herein contained to the contrary.
      The Holder may convert any portion of the outstanding principal amount of the
      Unsecured Debentures subject to a Company Prepayment Notice prior to the date
      that the Company Prepayment Price is due and paid in full. Once delivered, the
      Company shall not be entitled to rescind a Company Prepayment Notice.

(b)
           The Company Prepayment Price shall be due on the
      30th Trading Day immediately following the Company Notice Date. Any
      such prepayment shall be free of any claim of subordination. If any portion of
      the Company Prepayment Price shall not be timely paid by the Company, interest
      shall accrue thereon at the rate of 12% per annum (or the maximum rate
      permitted by applicable law, whichever is less) until the Company Prepayment
      Price plus all such interest is paid in full, which payment shall constitute
      liquidated damages and not a penalty. In addition, if any portion of the
      Company Prepayment Price remains unpaid after such date, the Holder subject to
      such prepayment may elect by written notice to the Company to invalidate ab
      initio such Company Prepayment Notice with respect to the unpaid amount,
      notwithstanding anything herein contained to the contrary. If the Holder makes
      such an election, this Unsecured Debenture shall be reinstated with respect to
      such unpaid amount and the Company shall no longer have any prepayment rights
      under this Section 7.

8.
           Ranking. This Unsecured Debenture ranks
      pari passu with all other Unsecured Debentures now or hereafter issued pursuant
      to the Transaction Documents. Except as set forth in Schedule 3.1(x) to
      the Purchase Agreement, no indebtedness of the Company is senior to this
      Unsecured Debenture in right of payment, whether with respect of interest,
      damages or upon liquidation or dissolution or otherwise. Other than in
      connection with the Company's reimbursement obligation to Wachovia Bank,
      National Association pursuant to the Letter of Credit to be issued in
      connection with the issuance of the Secured Debentures and except as set forth
      in Schedule 3.1(x) to the Purchase Agreement, the Company will not, and
      will not permit any Subsidiary to, directly or indirectly, enter into, create,
      incur, assume or suffer to exist indebtedness of any kind, on or with respect
      to any of its property or assets now owned or

-20-

hereafter acquired or any interest therein or any income or profits
      therefrom, that is senior in any respect to the Company's obligations under the
      Unsecured Debentures.

9.
           Miscellaneous.

(a)
           This Unsecured Debenture shall be binding on and
      inure to the benefit of the parties hereto and their respective successors and
      assigns. This Unsecured Debenture may be amended only in writing signed by the
      Company and the Holder and their successors and assigns.

(b)
           Subject to Section 9(a), above, nothing in
      this Unsecured Debenture shall be construed to give to any Person other than
      the Company and the Holder any legal or equitable right, remedy or cause under
      this Unsecured Debenture. This Unsecured Debenture shall inure to the sole and
      exclusive benefit of the Company and the Holder.

(c)
           All questions concerning the construction,
      validity, enforcement and interpretation of this Unsecured Debenture shall be
      governed by and construed and enforced in accordance with the internal laws of
      the State of New York, without regard to the principles of conflicts of law
      thereof. Each party agrees that all Proceedings shall be commenced exclusively
      in the state and federal courts sitting in the City of New York, Borough of
      Manhattan (the "New York Courts"). Each party hereto hereby irrevocably
      submits to the exclusive jurisdiction of the New York Courts for any
      proceeding, and hereby irrevocably waives, and agrees not to assert in any
      Proceeding, any claim that it is not personally subject to the jurisdiction of
      any New York Court or that a New York Court is an inconvenient forum for such
      Proceeding. Each party hereto hereby irrevocably waives personal service of
      process and consents to process being served in any such Proceeding by mailing
      a copy thereof via registered or certified mail or overnight delivery (with
      evidence of delivery) to such party at the address in effect for notices to it
      under this Unsecured Debenture and agrees that such service shall constitute
      good and sufficient service of process and notice thereof. Nothing contained
      herein shall be deemed to limit in any way any right to serve process in any
      manner permitted by law. Each party hereto hereby irrevocably waives, to the
      fullest extent permitted by applicable law, any and all right to trial by jury
      in any legal Proceeding. If either party shall commence a Proceeding, then the
      prevailing party in such Proceeding shall be reimbursed by the other party for
      its attorney's fees and other costs and expenses incurred with the
      investigation, preparation and prosecution of such Proceeding.

(d)
           The headings herein are for convenience only, do
      not constitute a part of this Unsecured Debenture and shall not be deemed to
      limit or affect any of the provisions hereof.

(e)
           In case any one or more of the provisions of this
      Unsecured Debenture shall be invalid or unenforceable in any respect, the
      validity and enforceability of the remaining terms and provisions of this
      Unsecured Debenture shall not in any way be affected or impaired thereby and
      the parties will attempt in good faith to agree upon a valid and enforceable
      provision which shall be a commercially reasonable substitute therefor, and
      upon so agreeing, shall incorporate such substitute provision in this Unsecured
      Debenture.

-21-

(f)
           No provision of this Unsecured Debenture may be
      waived or amended except in a written instrument signed, in the case of an
      amendment, by the Company and the Holder or, or, in the case of a waiver, by
      the Holder. No waiver of any default with respect to any provision, condition
      or requirement of this Unsecured Debenture shall be deemed to be a continuing
      waiver in the future or a waiver of any subsequent default or a waiver of any
      other provision, condition or requirement hereof, nor shall any delay or
      omission of either party to exercise any right hereunder in any manner impair
      the exercise of any such right.

(g)
           If it shall be found that any interest due
      hereunder shall violate applicable laws governing usury, the applicable rate of
      interest due hereunder shall be reduced to the maximum permitted rate of
      interest under such law.

-22-

(h)
            Except pursuant to Sections 5(d)(ii), 6 and 7
      hereunder, the outstanding principal amount and interest under this Unsecured
      Debenture may not be prepaid by the Company without the prior written consent
      of the Holder.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK SIGNATURE PAGE FOLLOWS]

-23-

IN WITNESS WHEREOF, the Company has caused
      this Unsecured Debenture to be duly executed by a duly authorized officer as of
      the date first above indicated.

| | MILLENNIUM CELL INC.                                                                                
| | ----------------------------------------------------------------------------------------------------
| |                                                                                                     
| | By: /s/ Norman R. Harpster, Jr.Name: Norman
          R. Harpster, Jr.Title: Chief Financial Officer

-24-

EXHIBIT A

HOLDER CONVERSION NOTICE

(To be Executed by the Registered Holder in order to convert
      Unsecured Debentures)

The undersigned hereby elects to convert
      the principal amount of Unsecured Debenture indicated below, into shares of
      Common Stock of Millennium Cell Inc., as of the date written below. If shares
      are to be issued in the name of a Person other than undersigned, the
      undersigned will pay all transfer taxes payable with respect thereto and is
      delivering herewith such certificates and opinions as reasonably requested by
      the Company in accordance therewith. No fee will be charged to the Holder for
      any conversion, except for such transfer taxes, if any. All terms used in this
      notice shall have the meanings set forth in the Unsecured Debenture.

|Conversion calculations: |                                                                                                                                                                                                                          
|------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                         | ________________________________________________Date to Effect
          Conversion                                                                                                                                      
|                         | ________________________________________________  Principal
          amount of Unsecured Debenture owned prior to conversion                                                                                            
|                         | ________________________________________________ Principal
          amount of Unsecured Debenture to be Converted  (including _______________
          of interest added under Section 2(b) of the Unsecured Debenture)
|                         | ___________________________________________________  Principal
          amount of Unsecured Debenture remaining after Conversion                                                                                        
|                         | _________________________________________________  Number of
          shares of Common Stock to be Issued                                                                                                               
|                         | __________________________________________________  Applicable
          Conversion Price                                                                                                                                
|                         | __________________________________________________  Name of
          Holder                                                                                                                                             
|                         | By:_______________________________________________ Name:
          Title:                                                                                                                                                
|                         |                                                                                                                                                                                                                          

[ ] By the delivery of this Conversion Notice the Holder represents and
      warrants to the Company that its ownership of the Common Stock does not exceed
      the restrictions set forth in Section 5(d)(i) of the Unsecured Debenture.

EXHIBIT B

COMPANY CONVERSION NOTICE

(To be executed by the Company in order to convert the Unsecured
      Debenture)

The undersigned in the name and on behalf
      of Millennium Cell Inc., hereby elects to convert the principal amount of
      Unsecured Debenture indicated below, into shares of Common Stock of Millennium
      Cell Inc., as of the date written below. If shares are to be issued in the name
      of a Person other than undersigned, the undersigned will pay all transfer taxes
      payable with respect thereto and is delivering herewith such certificates and
      opinions as reasonably requested by the Company in accordance therewith. No fee
      will be charged to the Holder for any conversion, except for such transfer
      taxes, if any. All terms used in this notice shall have the meanings set forth
      in the Unsecured Debenture.

|Conversion calculations: |                                                                                                                                                                                                                          
|------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|                         | ________________________________________________ Date to Effect
          Conversion                                                                                                                                     
|                         | ________________________________________________  Principal
          amount of Unsecured Debenture owned prior to conversion                                                                                            
|                         | ________________________________________________  Principal
          amount of Unsecured Debenture to be Converted (including _______________ of
          interest added under Section 2(b) of the Unsecured Debenture)
|                         | ___________________________________________________  Principal
          amount of Unsecured Debenture remaining after Conversion                                                                                        
|                         | _________________________________________________  Number of
          shares of Common Stock to be Issued                                                                                                               
|                         | __________________________________________________  Applicable
          Conversion Price                                                                                                                                
|                         | __________________________________________________  Name of
          Holder                                                                                                                                             
|                         | By:_______________________________________________ 
          Name:Title:                                                                                                                                                
|                         | MILLENNIUM CELL INC.                                                                                                                                                                                                     
|                         | By:_______________________________________________ 
          Name:Title:                                                                                                                                                

-2-

Schedule 1

CONVERSION SCHEDULE

Unsecured Debentures due on June 26, 2003 in the aggregate principal
      amount of $3,500,000 issued by Millennium Cell Inc. This Conversion Schedule
      reflects conversions made under the above referenced Unsecured Debentures.

Dated:





|Date of Conversion | Amount ofConversion | AggregatePrincipalAmountRemainingSubsequent toConversion | Applicable
          ConversionPrice
|------------------ | ------------------- | -------------------------------------------------------- | ------------------------------------
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     
|                   |                     |                                                          |                                     

-3-