Document:

Exhibit
4.2

 

NEITHER
THE ISSUANCE AND SALE OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE NOR THE SECURITIES INTO WHICH THESE SECURITIES ARE EXERCISABLE
HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR APPLICABLE STATE SECURITIES LAWS. THE SECURITIES MAY NOT
BE OFFERED FOR SALE, SOLD, TRANSFERRED OR ASSIGNED (I) IN THE ABSENCE OF (A) AN EFFECTIVE REGISTRATION STATEMENT FOR THE SECURITIES
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR (B) AN OPINION OF COUNSEL SELECTED BY THE HOLDER, IN FORM AND SUBSTANCE REASONABLY
ACCEPTABLE TO THE COMPANY, THAT REGISTRATION IS NOT REQUIRED UNDER SAID ACT OR (II) UNLESS SOLD PURSUANT TO RULE 144 OR RULE 144A
UNDER SAID ACT. NOTWITHSTANDING THE FOREGOING, THE SECURITIES MAY BE PLEDGED IN CONNECTION WITH A BONA FIDE MARGIN ACCOUNT OR
OTHER LOAN OR FINANCING ARRANGEMENT SECURED BY THE SECURITIES.

 

ENER-CORE,
INC.

 

Warrant
To Purchase Common Stock

 

Warrant
No.: __________

Number
of Shares of Common Stock: __________

Date
of Issuance: December [__], 2018 (“Issuance Date”)

 

Ener-Core,
Inc., a Delaware corporation (the “Company”), hereby certifies that, for good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, [BUYER], the registered
holder hereof or its permitted assigns (the “Holder”), is entitled, subject to the terms set forth below, to
purchase from the Company, at the Exercise Price (as defined below) then in effect, at any time or times on or after the Issuance
Date, but not after 11:59 p.m., New York time, on the Expiration Date, (as defined below), ______________ (_____________) fully
paid nonassessable shares of Common Stock, subject to adjustment as provided herein (the “Warrant Shares”).
Except as otherwise defined herein, capitalized terms in this Warrant to Purchase Common Stock (including any Warrants to Purchase
Common Stock issued in exchange, transfer or replacement hereof, this “Warrant”), shall have the meanings set
forth in Section 17. This Warrant is one of the Warrants to purchase Common Stock (the “SPA Warrants”) issued
pursuant to Section 1 of that certain Securities Purchase Agreement, dated as of December [__], 2018 (the “Subscription
Date”), by and among the Company and the investors (the “Buyers”) referred to therein (as amended,
restated, modified or joined from time to time, the “Securities Purchase Agreement”). Capitalized terms used
herein and not otherwise defined shall have the definitions ascribed to such terms in the Securities Purchase Agreement.

 

1.
EXERCISE OF WARRANT.

 

(a)
Mechanics of Exercise. Subject to the terms and conditions hereof (including, without limitation, the limitations set forth
in Section 1(f)), this Warrant may be exercised by the Holder at any time or times on or after the Issuance Date, in whole or
in part, by (i) delivery of a written notice, in the form attached hereto as Exhibit A (the “Exercise Notice”),
of the Holder’s election to exercise this Warrant and (ii) (A) payment to the Company of an amount equal to the applicable
Exercise Price multiplied by the number of Warrant Shares as to which this Warrant is being exercised (the “Aggregate
Exercise Price”) in cash by wire transfer of immediately available funds or (B) by notifying the Company that this Warrant
is being exercised pursuant to a Cashless Exercise (as defined in Section 1(d)). The Holder shall not be required to deliver the
original Warrant in order to effect an exercise hereunder. Execution and delivery of the Exercise Notice with respect to less
than all of the Warrant Shares shall have the same effect as cancellation of the original Warrant and issuance of a new Warrant
evidencing the right to purchase the remaining number of Warrant Shares. On or before the first (1st) Trading Day following
the date on which the Company has received the Exercise Notice, the Company shall transmit by facsimile or electronic mail an
acknowledgment of confirmation of receipt of the Exercise Notice to the Holder and the Company’s transfer agent (the “Transfer
Agent”). On or before the earlier of (i) the third (3rd) Trading Day and (ii) the number of Trading Days comprising
the Standard Settlement Period, in each case, following the date on which the Holder has delivered the Exercise Notice, so long
as the Holder delivers the Aggregate Exercise Price (or notice of a Cashless Exercise) on or prior to the second (2nd) Trading
Day following the date on which the Company has received the Exercise Notice (such earlier date, the “Share Delivery
Date”) (provided that if the Aggregate Exercise Price has not been delivered by such date, the Share Delivery Date shall
be one (1) Trading Day after the Aggregate Exercise Price (or notice of a Cashless Exercise) is delivered), the Company shall
(X) provided that the Transfer Agent is participating in The Depository Trust Company (“DTC”) Fast Automated
Securities Transfer Program, credit such aggregate number of Warrant Shares to which the Holder is entitled pursuant to such exercise
to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian system, or
(Y) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program, issue and dispatch by overnight
courier to the address as specified in the Exercise Notice, a certificate, registered in the Company’s share register in
the name of the Holder or its designee, for the number of Warrant Shares to which the Holder is entitled pursuant to such exercise.
The Company shall be responsible for all fees and expenses of the Transfer Agent and all fees and expenses with respect to the
issuance of Warrant Shares via DTC, if any. Upon delivery of the Exercise Notice, the Holder shall be deemed for purposes of Rule
200(b) of Regulation SHO to have become the owner of the Warrant Shares with respect to which this Warrant has been exercised,
irrespective of the date such Warrant Shares are credited to the Holder’s DTC account or the date of delivery of the certificates
evidencing such Warrant Shares, as the case may be, provided that the Holder delivers the Aggregate Exercise Price (or
a duly executed notice of a Cashless Exercise) on or prior to the second (2nd) Trading Day following the date on which
the Exercise Notice has been delivered to the Company. If this Warrant is physically delivered to the Company in connection with
any exercise pursuant to this Section 1(a) and the number of Warrant Shares represented by this Warrant submitted for exercise
is greater than the number of Warrant Shares being acquired upon an exercise, then the Company shall as soon as practicable and
in no event later than three (3) Trading Days after any exercise and at its own expense, issue to the Holder (or its designee)
a new Warrant (in accordance with Section 7(d)) representing the right to purchase the number of Warrant Shares issuable immediately
prior to such exercise under this Warrant, less the number of Warrant Shares with respect to which this Warrant is exercised.
No fractional Warrant Shares are to be issued upon the exercise of this Warrant, but rather the number of Warrant Shares to be
issued shall be rounded up to the nearest whole number. The Company shall pay any and all taxes which may be payable with respect
to the issuance and delivery of Warrant Shares upon exercise of this Warrant. The Company’s obligations to issue and deliver
Warrant Shares in accordance with the terms and subject to the conditions hereof 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;
provided, however, that the Company shall not be required to deliver Warrant Shares with respect to an exercise prior to the Holder’s
delivery of the Aggregate Exercise Price (or notice of a Cashless Exercise) with respect to such exercise.

 

     

     

    

 

(b)
Exercise Price. For purposes of this Warrant, “Exercise Price” means $0.10, subject to adjustment as
provided herein.

 

(c)
Company’s Failure to Timely Deliver Securities. If the Company shall fail for any reason or for no reason to issue
to the Holder on or prior to the Share Delivery Date, if the Transfer Agent is not participating in the DTC Fast Automated Securities
Transfer Program, a certificate for the number of shares of Common Stock to which the Holder is entitled and register such shares
of Common Stock on the Company’s share register or if the Transfer Agent is participating in the DTC Fast Automated Securities
Transfer Program, to credit the Holder’s balance account with DTC, for such number of shares of Common Stock to which the
Holder is entitled upon the Holder’s exercise of this Warrant (an “Exercise Failure”), then, in addition
to all other remedies available to the Holder, and if on or after such Trading Day the Holder purchases (in an open market transaction
or otherwise) shares of Common Stock to deliver in satisfaction of a sale by the Holder of shares of Common Stock issuable upon
such exercise that the Holder anticipated receiving from the Company (a “Buy-In”), then the Company shall,
within three (3) Trading Days after the Holder’s request and in the Holder’s discretion, either (i) pay cash to the
Holder in an amount equal to the Holder’s total purchase price (including brokerage commissions and other out-of-pocket
expenses, if any) for the shares of Common Stock so purchased (the “Buy-In Price”), at which point the Company’s
obligation to deliver such certificate (and to issue such shares of Common Stock) or credit such Holder’s balance account
with DTC for such shares of Common Stock shall terminate, or (ii) promptly honor its obligation to deliver to the Holder a certificate
or certificates representing such shares of Common Stock or credit such Holder’s balance account with DTC, as applicable,
and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of (A) such number of
shares of Common Stock, times (B) any trading price of the Common Stock selected by the Holder in writing as in effect at any
time during the period beginning on the applicable Exercise Date and ending on the applicable Share Delivery Date. Nothing shall
limit the Holder’s right to pursue any other remedies available to it hereunder, at law or in equity, including, without
limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver
certificates representing shares of Common Stock (or to electronically deliver such shares of Common Stock) upon the exercise
of this Warrant as required pursuant to the terms hereof.

 

(d)
Cashless Exercise. Notwithstanding anything contained herein to the contrary, if the Registration Statement covering the
resale of the Warrant Shares that are the subject of the Exercise Notice (the “Unavailable Warrant Shares”)
is not available for the resale of such Unavailable Warrant Shares, the Holder may, in its sole discretion, elect to exercise
this Warrant in whole or in part and, in lieu of making the cash payment otherwise contemplated to be made to the Company upon
such exercise in payment of the Aggregate Exercise Price, elect instead to receive upon such exercise the “Net Number”
of shares of Common Stock determined according to the following formula (a “Cashless Exercise”):

 

	 	Net Number =	(A x B) - (A x C)	 
	 	 	D	 

 

For purposes of the foregoing formula:

 

	 	A=	the total number of shares with respect to which this Warrant is then being exercised.
	 	 	 
	 	B=	the arithmetic average of the Closing Sale Prices of the Common Stock for the five (5) consecutive Trading Days ending on the date immediately preceding the date of the Exercise Notice.
	 	 	 
	 	C=	the Exercise Price then in effect for the applicable Warrant Shares at the time of such exercise.
	 	 	 
	 	D=	the Closing Sale Price of the Common Stock on the date of the Exercise Notice.

 

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For
purposes of Rule 144(d) promulgated under the 1933 Act, as in effect on the date hereof, it is intended that the Warrant Shares
issued in a Cashless Exercise shall be deemed to have been acquired by the Holder, and the holding period for the Warrant Shares
shall be deemed to have commenced, on the date this Warrant was originally issued pursuant to the Securities Purchase Agreement.

 

(e)
Disputes. In the case of a dispute as to the determination of the Exercise Price or the arithmetic calculation of the Warrant
Shares, the Company shall promptly issue to the Holder the number of Warrant Shares that are not disputed and resolve such dispute
in accordance with Section 12.

 

(f)
Beneficial Ownership. Notwithstanding anything to the contrary contained herein, the Company shall not effect the exercise
of any portion of this Warrant, and the Holder shall not have the right to exercise any portion of this Warrant, pursuant to the
terms and conditions of this Warrant and any such exercise shall be null and void and treated as if never made, to the extent
that after giving effect to such exercise, the Holder together with the other Attribution Parties collectively would beneficially
own in excess of [4.99%/9.99%]1 (the “Maximum Percentage”) of the number of shares of Common Stock
outstanding immediately after giving effect to such exercise. For purposes of the foregoing sentence, the aggregate number of
shares of Common Stock beneficially owned by the Holder and the other Attribution Parties shall include the number of shares of
Common Stock held by the Holder and all other Attribution Parties plus the number of shares of Common Stock issuable upon exercise
of this Warrant with respect to which the determination of such sentence is being made, but shall exclude the number of shares
of Common Stock which would be issuable upon (A) exercise of the remaining, unexercised portion of this Warrant beneficially owned
by the Holder or any of the other Attribution Parties and (B) exercise or conversion of the unexercised or unconverted portion
of any other securities of the Company (including, without limitation, any convertible notes or convertible preferred stock or
warrants, including the other SPA Warrants) beneficially owned by the Holder or any other Attribution Party subject to a limitation
on conversion or exercise analogous to the limitation contained in this Section 1(f). For purposes of this Section 1(f), beneficial
ownership shall be calculated in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended (the “1934
Act”). For purposes of this Warrant, in determining the number of outstanding shares of Common Stock the Holder may
acquire upon the exercise of this Warrant without exceeding the Maximum Percentage, the Holder may rely on the number of outstanding
shares of Common Stock as reflected in (x) the Company’s most recent Annual Report on Form 10-K, Quarterly Report on Form
10-Q, Current Report on Form 8-K or other public filing with the Securities and Exchange Commission (the “SEC”),
as the case may be, (y) a more recent public announcement by the Company or (3) any other written notice by the Company or the
Transfer Agent setting forth the number of shares of Common Stock outstanding (the “Reported Outstanding Share Number”).
If the Company receives an Exercise Notice from the Holder at a time when the actual number of outstanding shares of Common Stock
is less than the Reported Outstanding Share Number, the Company shall (i) notify the Holder in writing of the number of shares
of Common Stock then outstanding and, to the extent that such Exercise Notice would otherwise cause the Holder’s beneficial
ownership, as determined pursuant to this Section 1(f), to exceed the Maximum Percentage, the Holder must notify the Company of
a reduced number of Warrant Shares to be purchased pursuant to such Exercise Notice (the number of shares by which such purchase
is reduced, the “Reduction Shares”) and (ii) as soon as reasonably practicable, the Company shall return to
the Holder any exercise price paid by the Holder for the Reduction Shares. For any reason at any time, upon the written or oral
request of the Holder, the Company shall within one (1) Business Day confirm orally and in writing or by electronic mail to the
Holder the number of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall
be determined after giving effect to the conversion or exercise of securities of the Company, including this Warrant, by the Holder
and any other Attribution Party since the date as of which the Reported Outstanding Share Number was reported. In the event that
the issuance of shares of Common Stock to the Holder upon exercise of this Warrant results in the Holder and the other Attribution
Parties being deemed to beneficially own, in the aggregate, more than the Maximum Percentage of the number of outstanding shares
of Common Stock (as determined under Section 13(d) of the 1934 Act), the number of shares so issued by which the Holder’s
and the other Attribution Parties’ aggregate beneficial ownership exceeds the Maximum Percentage (the “Excess Shares”)
shall be deemed null and void and shall be cancelled ab initio, and the Holder shall not have the power to vote or to transfer
the Excess Shares. As soon as reasonably practicable after the issuance of the Excess Shares has been deemed null and void, the
Company shall return to the Holder the exercise price paid by the Holder for the Excess Shares. Upon delivery of a written notice
to the Company, the Holder may from time to time increase or decrease the Maximum Percentage to any other percentage not in excess
of 9.99% as specified in such notice; provided that (i) any such increase in the Maximum Percentage will not be effective until
the sixty-first (61st) day after such notice is delivered to the Company and (ii) any such increase or decrease will
apply only to the Holder and the other Attribution Parties and not to any other holder of SPA Warrants that is not an Attribution
Party of the Holder. For purposes of clarity, the shares of Common Stock issuable pursuant to the terms of this Warrant in excess
of the Maximum Percentage shall not be deemed to be beneficially owned by the Holder for any purpose including for purposes of
Section 13(d) or Rule 16a-1(a)(1) of the 1934 Act. No prior inability to exercise this Warrant pursuant to this paragraph shall
have any effect on the applicability of the provisions of this paragraph with respect to any subsequent determination of exercisability.
The provisions of this paragraph shall be construed and implemented in a manner otherwise than in strict conformity with the terms
of this Section 1(f) to the extent necessary to correct this paragraph or any portion of this paragraph which may be defective
or inconsistent with the intended beneficial ownership limitation contained in this Section 1(f) or to make changes or supplements
necessary or desirable to properly give effect to such limitation. The limitation contained in this paragraph may not be waived
and shall apply to a successor holder of this Warrant.

 

 

1 At the Holder’s
election.

 

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(g)
Insufficient Authorized Shares. If at any time while this Warrant remains outstanding the Company does not have a sufficient
number of authorized and unreserved shares of Common Stock to satisfy its obligation to reserve for issuance upon exercise of
this Warrant at least a number of shares of Common Stock equal to 100% of the number of shares of Common Stock as shall from time
to time be necessary to effect the exercise of all of this Warrant then outstanding (the “Required Reserve Amount”
and the failure to have such sufficient number of authorized and unreserved shares of Common Stock, an “Authorized Share
Failure”), then the Company shall immediately take all action necessary to increase the Company’s authorized shares
of Common Stock to an amount sufficient to allow the Company to reserve the Required Reserve Amount for this Warrant then outstanding.
Without limiting the generality of the foregoing sentence, as soon as practicable after the date of the occurrence of an Authorized
Share Failure, but in no event later than sixty (60) days after the occurrence of such Authorized Share Failure, the Company shall
hold a meeting of its stockholders for the approval of an increase in the number of authorized shares of Common Stock. In connection
with such meeting, the Company shall provide each stockholder with a proxy statement and shall use its best efforts to solicit
its stockholders’ approval of such increase in authorized shares of Common Stock and to cause its board of directors to
recommend to the stockholders that they approve such proposal. Notwithstanding the foregoing, if any such time of an Authorized
Share Failure, the Company is able to obtain the written consent of a majority of the shares of its issued and outstanding Common
Stock to approve the increase in the number of authorized shares of Common Stock, the Company may satisfy this obligation by obtaining
such consent and submitting for filing with the SEC an Information Statement on Schedule 14C. In the event that upon any exercise
of this Warrant, the Company does not have sufficient authorized shares to deliver in satisfaction of such exercise, then unless
the Holder elects to void such attempted exercise, the Holder may require the Company to pay to the Holder within three (3) Trading
Days of the applicable exercise, cash in an amount equal to the product of (i) the quotient determined by dividing (x) the number
of Warrant Shares that the Company is unable to deliver pursuant to this Section 1(g), by (y) the total number of Warrant Shares
issuable upon exercise of this Warrant (without regard to any limitations or restrictions on exercise of this Warrant) and (ii)
the Black Scholes Value; provided, that (x) references to “the day immediately following the public announcement of the
applicable Fundamental Transaction” in the definition of “Black Scholes Value” shall instead refer to “the
date the Holder exercises this Warrant and the Company cannot deliver the required number of Warrant Shares because of an Authorized
Share Failure” and (y) clause (iii) of the definition of “Black Scholes Value” shall instead refer to “the
underlying price per share used in such calculation shall be the highest Weighted Average Price during the period beginning on
the date of the applicable date of exercise and the date that the Company makes the applicable cash payment.”

 

2. ADJUSTMENT
OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES. The Exercise Price and the number of Warrant Shares shall be adjusted
from time to time as follows:

 

(a)
Voluntary Adjustment By Company. The Company may at any time during the term of this Warrant, with the prior written consent
of the Required Holders, reduce the then current Exercise Price to any amount and for any period of time deemed appropriate by
the Board of Directors of the Company.

 

(b)
Adjustment Upon Subdivision or Combination of Shares of Common Stock. If the Company at any time on or after the Subscription
Date subdivides (by any stock split, stock dividend, recapitalization or otherwise) one or more classes of its outstanding shares
of Common Stock into a greater number of shares, the Exercise Price in effect immediately prior to such subdivision will be proportionately
reduced and the number of Warrant Shares will be proportionately increased. If the Company at any time on or after the Subscription
Date combines (by combination, reverse stock split or otherwise) one or more classes of its outstanding shares of Common Stock
into a smaller number of shares, the Exercise Price in effect immediately prior to such combination will be proportionately increased
and the number of Warrant Shares will be proportionately decreased. Any adjustment under this Section 2(b) shall become effective
at the close of business on the date the subdivision or combination becomes effective.

 

3.
RIGHTS UPON DISTRIBUTION OF ASSETS. If the Company shall declare or make any dividend or other distribution of its assets
(or rights to acquire its assets) to holders of shares of Common Stock, by way of return of capital or otherwise (including, without
limitation, any distribution of cash, stock or other securities, property, options, evidence of indebtedness or any other assets
by way of a dividend, spin off, reclassification, corporate rearrangement, scheme of arrangement or other similar transaction)
(a “Distribution”), at any time after the issuance of this Warrant, then, in each such case, the Holder shall
be entitled to participate in such Distribution to the same extent that the Holder would have participated therein if the Holder
had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to any limitations
or restrictions on exercise of this Warrant, including without limitation, the Maximum Percentage) immediately before the date
of which a record is taken for such Distribution, or, if no such record is taken, the date as of which the record holders of shares
of Common Stock are to be determined for the participation in such Distribution (provided, however, that to the
extent that the Holder’s right to participate in any such Distribution would result in the Holder and the other Attribution
Parties exceeding the Maximum Percentage, then the Holder shall not be entitled to participate in such Distribution to such extent
(and shall not be entitled to beneficial ownership of such shares of Common Stock as a result of such Distribution (and beneficial
ownership) to such extent) and the portion of such Distribution shall be held in abeyance for the benefit of the Holder until
such time or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum
Percentage, at which time or times the Holder shall be granted such Distribution (and any Distributions declared or made on such
initial Distribution or on any subsequent Distribution held similarly in abeyance) to the same extent as if there had been no
such limitation).

 

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4.
PURCHASE RIGHTS; FUNDAMENTAL TRANSACTIONS.

 

(a)
Purchase Rights. In addition to any adjustments pursuant to Section 2 above, if at any time on or after the Subscription
Date and on or prior to the Expiration Date, the Company grants, issues or sells any Options, Convertible Securities or rights
to purchase stock, warrants, securities or other property pro rata to the record holders of any class of Common Stock (the “Purchase
Rights”), then the Holder will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate
Purchase Rights which the Holder could have acquired if the Holder had held the number of shares of Common Stock acquirable upon
complete exercise of this Warrant (without regard to any limitations or restrictions on exercise of this Warrant, including without
limitation, the Maximum Percentage) immediately before the date on which a record is taken for the grant, issuance or sale of
such Purchase Rights, or, if no such record is taken, the date as of which the record holders of shares of Common Stock are to
be determined for the grant, issue or sale of such Purchase Rights (provided, however, that to the extent that the
Holder’s right to participate in any such Purchase Right would result in the Holder and the other Attribution Parties exceeding
the Maximum Percentage, then the Holder shall not be entitled to participate in such Purchase Right to such extent (and shall
not be entitled to beneficial ownership of such shares of Common Stock as a result of such Purchase Right (and beneficial ownership)
to such extent) and such Purchase Right to such extent shall be held in abeyance for the benefit of the Holder until such time
or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum Percentage,
at which time or times the Holder shall be granted such right (and any Purchase Right granted, issued or sold on such initial
Purchase Right or on any subsequent Purchase Right held similarly in abeyance) to the same extent as if there had been no such
limitation).

 

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(b)
Fundamental Transactions. The Company shall not enter into or be party to a Fundamental Transaction unless the Successor
Entity assumes in writing all of the obligations of the Company under this Warrant and the other Transaction Documents in accordance
with the provisions of this Section 4(b) pursuant to written agreements in form and substance satisfactory to the Required Holders
and approved by the Required Holders prior to such Fundamental Transaction, including agreements, if so requested by the Holder,
to deliver to each holder of the SPA Warrants in exchange for such SPA Warrants a security of the Successor Entity evidenced by
a written instrument substantially similar in form and substance to this Warrant, including, without limitation, an adjusted exercise
price equal to the value for the shares of Common Stock reflected by the terms of such Fundamental Transaction, and exercisable
for a corresponding number of shares of capital stock equivalent to the shares of Common Stock acquirable and receivable upon
exercise of this Warrant (without regard to any limitations on the exercise of this Warrant) prior to such Fundamental Transaction,
and satisfactory to the Required Holders, and with an exercise price which applies the exercise price hereunder to such shares
of capital stock (but taking into account the relative value of the shares of Common Stock pursuant to such Fundamental Transaction
and the value of such shares of capital stock, such adjustments to the number of shares of capital stock and such exercise price
being for the purpose of protecting the economic value of this Warrant immediately prior to the occurrence or consummation of
such Fundamental Transaction). Upon the occurrence or consummation of any Fundamental Transaction, and it shall be a required
condition to the occurrence or consummation of any Fundamental Transaction that, the Company and the Successor Entity or Successor
Entities, jointly and severally, shall succeed to, and the Company shall cause any Successor Entity or Successor Entities to jointly
and severally succeed to, and be added to the term “Company” under this Warrant (so that from and after the date of
such Fundamental Transaction, each and every provision of this Warrant referring to the “Company” shall refer instead
to each of the Company and the Successor Entity or Successor Entities, jointly and severally), and the Company and the Successor
Entity or Successor Entities, jointly and severally, may exercise every right and power of the Company prior thereto and shall
assume all of the obligations of the Company prior thereto under this Warrant with the same effect as if the Company and such
Successor Entity or Successor Entities, jointly and severally, had been named as the Company in this Warrant, and, solely at the
request of the Holder, if the Successor Entity and/or Successor Entities is/are a publicly traded corporation whose common stock
is quoted on or listed for trading on an Eligible Market, shall deliver (in addition to and without limiting any right under this
Warrant) to the Holder in exchange for this Warrant a security of the Successor Entity and/or Successor Entities evidenced by
a written instrument substantially similar in form and substance to this Warrant and exercisable for a corresponding number of
shares of capital stock of the Successor Entity and/or Successor Entities (the “Successor Capital Stock”) equivalent
to the shares of Common Stock acquirable and receivable upon exercise of this Warrant (without regard to any limitations on the
exercise of this Warrant) prior to such Fundamental Transaction (such corresponding number of shares of Successor Capital Stock
to be delivered to the Holder shall be equal to the greater of (A) the quotient of (i) the aggregate dollar value of all consideration
(including cash consideration and any consideration other than cash (“Non-Cash Consideration”), in such Fundamental
Transaction, as such values are set forth in any definitive agreement for the Fundamental Transaction that has been executed at
the time of the first public announcement of the Fundamental Transaction or, if no such value is determinable from such definitive
agreement, as determined in accordance with Section 12 with the term “Non-Cash Consideration” being substituted for
the term “Exercise Price”) that the Holder would have been entitled to receive upon the happening of such Fundamental
Transaction or the record, eligibility or other determination date for the event resulting in such Fundamental Transaction, had
this Warrant been exercised immediately prior to such Fundamental Transaction or the record, eligibility or other determination
date for the event resulting in such Fundamental Transaction (without regard to any limitations on the exercise of this Warrant)
(the “Aggregate Consideration”) divided by (ii) the per share Closing Sale Price of such Successor Capital
Stock on the Trading Day immediately prior to the consummation or occurrence of the Fundamental Transaction and (B) the product
of (i) the Aggregate Consideration and (ii) the highest exchange ratio pursuant to which any stockholder of the Company may exchange
Common Stock for Successor Capital Stock) (provided, however, to the extent that the Holder’s right to receive any such
shares of publicly traded common stock (or their equivalent) of the Successor Entity would result in the Holder and its other
Attribution Parties exceeding the Maximum Percentage, if applicable, then the Holder shall not be entitled to receive such shares
to such extent (and shall not be entitled to beneficial ownership of such shares of publicly traded common stock (or their equivalent)
of the Successor Entity as a result of such consideration to such extent) and the portion of such shares shall be held in abeyance
for the Holder until such time or times, as its right thereto would not result in the Holder and its other Attribution Parties
exceeding the Maximum Percentage, at which time or times the Holder shall be delivered such shares to the extent as if there had
been no such limitation), and such security shall be satisfactory to the Holder, and with an identical exercise price to the Exercise
Price hereunder (such adjustments to the number of shares of capital stock and such exercise price being for the purpose of protecting
after the consummation or occurrence of such Fundamental Transaction the economic value of this Warrant that was in effect immediately
prior to the consummation or occurrence of such Fundamental Transaction, as elected by the Holder solely at its option). Upon
occurrence or consummation of the Fundamental Transaction, and it shall be a required condition to the occurrence or consummation
of such Fundamental Transaction that, the Company and the Successor Entity or Successor Entities shall deliver to the Holder confirmation
that there shall be issued upon exercise of this Warrant at any time after the occurrence or consummation of the Fundamental Transaction,
as elected by the Holder solely at its option, shares of Common Stock, Successor Capital Stock or, in lieu of the shares of Common
Stock or Successor Capital Stock (or other securities, cash, assets or other property purchasable upon the exercise of this Warrant
prior to such Fundamental Transaction), such shares of stock, securities, cash, assets or any other property whatsoever (including
warrants or other purchase or subscription rights), which for purposes of clarification may continue to be shares of Common Stock,
if any, that the Holder would have been entitled to receive upon the happening of such Fundamental Transaction or the record,
eligibility or other determination date for the event resulting in such Fundamental Transaction, had this Warrant been exercised
immediately prior to such Fundamental Transaction or the record, eligibility or other determination date for the event resulting
in such Fundamental Transaction (without regard to any limitations on the exercise of this Warrant), as adjusted in accordance
with the provisions of this Warrant. In addition to and not in substitution for any other rights hereunder, prior to the occurrence
or consummation of any Fundamental Transaction pursuant to which holders of shares of Common Stock are entitled to receive securities,
cash, assets or other property with respect to or in exchange for shares of Common Stock (a “Corporate Event”),
the Company shall make appropriate provision to insure that, and any applicable Successor Entity or Successor Entities shall ensure
that, and it shall be a required condition to the occurrence or consummation of such Corporate Event that, the Holder will thereafter
have the right to receive upon exercise of this Warrant at any time after the occurrence or consummation of the Corporate Event,
shares of Common Stock or Successor Capital Stock or, if so elected by the Holder, in lieu of the shares of Common Stock (or other
securities, cash, assets or other property) purchasable upon the exercise of this Warrant prior to such Corporate Event (but not
in lieu of such items still issuable under Sections 3 and 4(a), which shall continue to be receivable on the Common Stock or on
such shares of stock, securities, cash, assets or any other property otherwise receivable with respect to or in exchange for shares
of Common Stock), such shares of stock, securities, cash, assets or any other property whatsoever (including warrants or other
purchase or subscription rights and any shares of Common Stock) which the Holder would have been entitled to receive upon the
occurrence or consummation of such Corporate Event or the record, eligibility or other determination date for the event resulting
in such Corporate Event, had this Warrant been exercised immediately prior to such Corporate Event or the record, eligibility
or other determination date for the event resulting in such Corporate Event (without regard to any limitations on exercise of
this Warrant). Provision made pursuant to the preceding sentence shall be in a form and substance reasonably satisfactory to the
Holder. The provisions of this Section 4(b) shall apply similarly and equally to successive Fundamental Transactions and Corporate
Events.

 

    - 6 -

     

    

 

(c)
Notwithstanding the foregoing, in the event of a Fundamental Transaction, at the request of the Holder delivered before the thirtieth
(30th) day after the occurrence or consummation of such Fundamental Transaction, the Company (or the Successor Entity) shall purchase
this Warrant from the Holder by paying to the Holder, within ten (10) Business Days after such request (or, if later, on the effective
date of the Fundamental Transaction), at the option of the Company, either (x) Common Stock (or corresponding consideration payable
as provided in the third-to-last sentence of Section 4(b) in connection with a Corporate Event, as applicable) valued at the value
of the consideration received by the shareholders in such Fundamental Transaction or (y) cash, in each case, in an amount equal
to the Black Scholes Value of the remaining unexercised portion of this Warrant on the effective date of such Fundamental Transaction.

 

5.
NONCIRCUMVENTION. The Company hereby covenants and agrees that the Company will not, by amendment of its Certificate of
Incorporation or Bylaws, or through any reorganization, transfer of assets, consolidation, merger, scheme of arrangement, dissolution,
issue or sale of securities, or any other voluntary action, avoid or seek to avoid the observance or performance of any of the
terms of this Warrant, and will at all times in good faith carry out all of the provisions of this Warrant and take all action
as may be required to protect the rights of the Holder. Without limiting the generality of the foregoing, the Company (i) shall
not increase the par value of any shares of Common Stock receivable upon the exercise of this Warrant above the Exercise Price
then in effect, (ii) shall take all such actions as may be necessary or appropriate in order that the Company may validly and
legally issue fully paid and nonassessable shares of Common Stock upon the exercise of this Warrant, and (iii) shall, so long
as any of the SPA Warrants are outstanding, take all action necessary to reserve and keep available out of its authorized and
unissued shares of Common Stock, solely for the purpose of effecting the exercise of the SPA Warrants, 100% of the number of shares
of Common Stock as shall from time to time be necessary to effect the exercise of the SPA Warrants then outstanding (without regard
to any limitations on exercise).

 

    - 7 -

     

    

 

6.
WARRANT HOLDER NOT DEEMED A STOCKHOLDER. Except as otherwise specifically provided
herein, the Holder, solely in such Person’s capacity as a holder of this Warrant, shall not be entitled to vote or receive
dividends or be deemed the holder of capital stock of the Company for any purpose, nor shall anything contained in this Warrant
be construed to confer upon the Holder, solely in such Person’s capacity as the Holder of this Warrant, any of the rights
of a stockholder of the Company or any right to vote, give or withhold consent to any corporate action (whether any reorganization,
issue of stock, reclassification of stock, consolidation, merger, conveyance or otherwise), receive notice of meetings, receive
dividends or subscription rights, or otherwise, prior to the issuance to the Holder of the Warrant Shares which such Person is
then entitled to receive upon the due exercise of this Warrant. In addition, nothing contained in this Warrant shall be construed
as imposing any liabilities on the Holder to purchase any securities (upon exercise of this Warrant or otherwise) or as a stockholder
of the Company, whether such liabilities are asserted by the Company or by creditors of the Company. Notwithstanding this Section
6, the Company shall provide the Holder with copies of the same notices and other information given to the stockholders of the
Company generally, contemporaneously with the giving thereof to the stockholders.

 

7. REISSUANCE
OF WARRANTS.

 

(a)
Transfer of Warrant. If this Warrant is to be transferred, the Holder shall surrender this Warrant to the Company, whereupon
the Company will forthwith issue and deliver upon the order of the Holder a new Warrant (in accordance with Section 7(d)), registered
as the Holder may request, representing the right to purchase the number of Warrant Shares being transferred by the Holder and,
if less than the total number of Warrant Shares then underlying this Warrant is being transferred, a new Warrant (in accordance
with Section 7(d)) to the Holder representing the right to purchase the number of Warrant Shares not being transferred.

 

(b)
Lost, Stolen or Mutilated Warrant. Upon receipt by the Company of evidence reasonably satisfactory to the Company of the
loss, theft, destruction or mutilation of this Warrant, and, in the case of loss, theft or destruction, of any indemnification
undertaking by the Holder to the Company in customary form and, in the case of mutilation, upon surrender and cancellation of
this Warrant, the Company shall execute and deliver to the Holder a new Warrant (in accordance with Section 7(d)) representing
the right to purchase the Warrant Shares then underlying this Warrant.

 

(c)
Exchangeable for Multiple Warrants. This Warrant is exchangeable, upon the surrender hereof by the Holder at the principal
office of the Company, for a new Warrant or Warrants (in accordance with Section 7(d)) representing in the aggregate the right
to purchase the number of Warrant Shares then underlying this Warrant, and each such new Warrant will represent the right to purchase
such portion of such Warrant Shares as is designated by the Holder at the time of such surrender; provided, however,
that no SPA Warrants for fractional Warrant Shares shall be given.

 

(d)
Issuance of New Warrants. Whenever the Company is required to issue a new Warrant pursuant to the terms of this Warrant,
such new Warrant (i) shall be of like tenor with this Warrant, (ii) shall represent, as indicated on the face of such new Warrant,
the right to purchase the Warrant Shares then underlying this Warrant (or in the case of a new Warrant being issued pursuant to
Section 7(a) or Section 7(c), the Warrant Shares designated by the Holder which, when added to the number of shares of Common
Stock underlying the other new Warrants issued in connection with such issuance, does not exceed the number of Warrant Shares
then underlying this Warrant), (iii) shall have an issuance date, as indicated on the face of such new Warrant which is the same
as the Issuance Date, and (iv) shall have the same rights and conditions as this Warrant.

 

    - 8 -

     

    

 

8. NOTICES.
Whenever notice is required to be given under this Warrant, unless otherwise provided herein, such notice shall be given in
accordance with Section 9(f) of the Securities Purchase Agreement. The Company shall provide the Holder with prompt written
notice of all actions taken pursuant to this Warrant, including in reasonable detail a description of such action and the
reason therefor. Without limiting the generality of the foregoing, the Company will give written notice to the Holder (i)
immediately upon any adjustment of the Exercise Price, setting forth in reasonable detail, and certifying, the calculation of
such adjustment and (ii) at least fifteen (15) days prior to the date on which the Company closes its books or takes a record
(A) with respect to any dividend or distribution upon the shares of Common Stock, (B) with respect to any grants, issuances
or sales of any Options, Convertible Securities or rights to purchase stock, warrants, securities or other property to
holders of shares of Common Stock or (C) for determining rights to vote with respect to any Fundamental
Transaction, dissolution or liquidation; provided in each case that such information shall be made known to the public
prior to or in conjunction with such notice being provided to the Holder. It is expressly understood and agreed that the time
of exercise specified by the Holder in each Exercise Notice shall be definitive and may not be disputed or challenged by the
Company.

 

9. AMENDMENT
AND WAIVER. Except as otherwise provided herein, the provisions of this Warrant may be amended or waived and the Company
may take any action herein prohibited, or omit to perform any act herein required to be performed by it, only if the Company
has obtained the written consent of the Required Holders.

 

10. GOVERNING
LAW; JURISDICTION; JURY TRIAL. This Warrant shall be governed by and construed and enforced in accordance with, and all
questions concerning the construction, validity, interpretation and performance of this Warrant shall be governed by, the
internal laws of the State of New York, without giving effect to any choice of law or conflict of law provision or rule
(whether of the State of New York or any other jurisdictions) that would cause the application of the laws of any
jurisdictions other than the State of New York. The Company hereby irrevocably submits to the exclusive jurisdiction of the
state and federal courts sitting in The City of New York, Borough of Manhattan, for the adjudication of any dispute
hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein, and hereby irrevocably
waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the
jurisdiction of any such court, that such suit, action or proceeding is brought in an inconvenient forum or that the venue of
such suit, action or proceeding is improper. The Company hereby irrevocably waives personal service of process and consents
to process being served in any such suit, action or proceeding by mailing a copy thereof to the Company at the address set
forth in Section 9(f) of the Securities Purchase Agreement 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. Nothing contained herein shall be deemed or operate to preclude the Holder from
bringing suit or taking other legal action against the Company in any other jurisdiction to collect on the Company’s
obligations to the Holder, to realize on any collateral or any other security for such obligations, or to enforce a judgment
or other court ruling in favor of the Holder. THE COMPANY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT
TO REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION WITH OR ARISING OUT OF THIS WARRANT
OR ANY TRANSACTION CONTEMPLATED HEREBY.

 

    - 9 -

     

    

 

11.
CONSTRUCTION; HEADINGS. This Warrant shall be deemed to be jointly drafted by the Company
and all the Buyers and shall not be construed against any Person as the drafter hereof. The headings of this Warrant are for convenience
of reference and shall not form part of, or affect the interpretation of, this Warrant.

 

12. DISPUTE
RESOLUTION. In the case of a dispute as to the determination of the Exercise Price or the arithmetic calculation of the
Warrant Shares, the Company shall submit the disputed determinations or arithmetic calculations via facsimile or electronic
mail within two (2) Business Days of receipt of the Exercise Notice giving rise to such dispute, as the case may be, to the
Holder. If the Holder and the Company are unable to agree upon such determination or calculation of the Exercise Price or the
Warrant Shares within three (3) Business Days of such disputed determination or arithmetic calculation being submitted to the
Holder, then the Company shall, within two (2) Business Days submit via facsimile or electronic mail (a) the disputed
determination of the Exercise Price to an independent, reputable investment bank selected by the Company and approved by the
Holder or (b) the disputed arithmetic calculation of the Warrant Shares to the Company’s independent, outside
accountant. The Company shall cause at its expense the investment bank or the accountant, as the case may be, to perform the
determinations or calculations and notify the Company and the Holder of the results no later than ten (10) Business Days from
the time it receives the disputed determinations or calculations. Such investment bank’s or accountant’s
determination or calculation, as the case may be, shall be binding upon all parties absent demonstrable error.

 

13. REMEDIES,
OTHER OBLIGATIONS, BREACHES AND INJUNCTIVE RELIEF. The remedies provided in this Warrant shall be cumulative and in
addition to all other remedies available under this Warrant and the other Transaction Documents, at law or in equity
(including a decree of specific performance and/or other injunctive relief), and nothing herein shall limit the right of the
Holder to pursue actual damages for any failure by the Company to comply with the terms of this Warrant. The Company
acknowledges that a breach by it of its obligations hereunder will cause irreparable harm to the Holder and that the remedy
at law for any such breach may be inadequate. The Company therefore agrees that, in the event of any such breach or
threatened breach, the holder of this Warrant shall be entitled, in addition to all other available remedies, to an
injunction restraining any breach, without the necessity of showing economic loss and without any bond or other security
being required.

 

14. TRANSFER;
LEGENDS.This Warrant and the Warrant Shares may be offered for sale, sold, transferred, pledged or assigned without
the consent of the Company, except as may otherwise be required by Section 2(f) of the Securities Purchase Agreement, and the
Warrants and Warrant Shares shall bear any legends required by Section 2(g) of the Securities Purchase Agreement.

 

15.
SEVERABILITY.If any provision of this Warrant is prohibited by law or otherwise determined to be invalid or unenforceable
by a court of competent jurisdiction, the provision that would otherwise be prohibited, invalid or unenforceable shall be deemed
amended to apply to the broadest extent that it would be valid and enforceable, and the invalidity or unenforceability of such
provision shall not affect the validity of the remaining provisions of this Warrant so long as this Warrant as so modified continues
to express, without material change, the original intentions of the parties as to the subject matter hereof and the prohibited
nature, invalidity or unenforceability of the provision(s) in question does not substantially impair the respective expectations
or reciprocal obligations of the parties or the practical realization of the benefits that would otherwise be conferred upon the
parties. The parties will endeavor in good faith negotiations to replace the prohibited, invalid or unenforceable provision(s)
with a valid provision(s), the effect of which comes as close as possible to that of the prohibited, invalid or unenforceable
provision(s).

 

    - 10 -

     

    

 

16.
DISCLOSURE. Upon receipt or delivery by the Company of any notice in accordance with the terms of this Warrant, unless
the Company has in good faith determined that the matters relating to such notice do not constitute material, nonpublic information
relating to the Company or its Subsidiaries (as defined in the Securities Purchase Agreement), the Company shall within one (1)
Business Day after any such receipt or delivery publicly disclose such material, nonpublic information on a Current Report on
Form 8-K or otherwise. In the event that the Company believes that a notice contains material, nonpublic information relating
to the Company or its Subsidiaries, the Company so shall indicate to such Holder contemporaneously with delivery of such notice,
and in the absence of any such indication, the Holder shall be allowed to presume that all matters relating to such notice do
not constitute material, nonpublic information relating to the Company or its Subsidiaries.

 

17. CERTAIN
DEFINITIONS. For purposes of this Warrant, the following terms shall have the following meanings:

 

(a)
“1933 Act” means the Securities Act of 1933, as amended.

 

(b)
“Affiliate” means, with respect to any Person, any other Person that directly or indirectly controls, is controlled
by, or is under common control with, such Person, it being understood for purposes of this definition that “control”
of a Person means the power directly or indirectly either to vote 10% or more of the stock having ordinary voting power for the
election of directors of such Person or direct or cause the direction of the management and policies of such Person whether by
contract or otherwise.

 

(c)
“Attribution Parties” means, collectively, the following Persons and entities: (i) any investment vehicle,
including, any funds, feeder funds or managed accounts, currently, or from time to time after the Issuance Date, directly or indirectly
managed or advised by the Holder’s investment manager or any of its Affiliates or principals, (ii) any direct or indirect
Affiliates of the Holder or any of the foregoing, (iii) any Person acting or who could be deemed to be acting as a Group together
with the Holder or any of the foregoing and (iv) any other Persons whose beneficial ownership of the Company’s Common Stock
would or could be aggregated with the Holder’s and the other Attribution Parties for purposes of Section 13(d) of the 1934
Act. For clarity, the purpose of the foregoing is to subject collectively the Holder and all other Attribution Parties to the
Maximum Percentage.

 

(d)
“Black Scholes Value” means the value of this Warrant based on the Black-Scholes Option Pricing Model obtained
from the “OV” function on Bloomberg determined as of the day immediately following the public announcement of the
applicable Fundamental Transaction, or, if the Fundamental Transaction is not publicly announced, the date the Fundamental Transaction
is consummated, for pricing purposes and reflecting (i) a risk-free interest rate corresponding to the U.S. Treasury rate for
a period equal to the remaining term of this Warrant as of such date of request, (ii) an expected volatility equal to the greater
of 100% and the 100 day volatility obtained from the HVT function on Bloomberg as of the day immediately following the public
announcement of the applicable Fundamental Transaction, or, if the Fundamental Transaction is not publicly announced, the date
the Fundamental Transaction is consummated, (iii) the underlying price per share used in such calculation shall be the sum of
the price per share being offered in cash, if any, plus the value of any non-cash consideration, if any, being offered in the
Fundamental Transaction, (iv) a zero cost of borrow and (v) a 360 day annualization factor.

 

(e)
“Bloomberg” means Bloomberg Financial Markets.

 

(f)
“Business Day” means any day other than Saturday, Sunday or other day on which commercial banks in The City
of New York are authorized or required by law to remain closed.

 

    - 11 -

     

    

 

(g)
“Closing Bid Price” and “Closing Sale Price” means, for any security as of any date, the
last closing bid price and last closing trade price, respectively, for such security on the Principal Market, as reported by Bloomberg,
or, if the Principal Market begins to operate on an extended hours basis and does not designate the closing bid price or the closing
trade price, as the case may be, then the last bid price or the last trade price, respectively, of such security prior to 4:00:00
p.m., New York time, as reported by Bloomberg, or, if the Principal Market is not the principal securities exchange or trading
market for such security, the last closing bid price or last trade price, respectively, of such security on the principal securities
exchange or trading market where such security is listed or traded as reported by Bloomberg, or if the foregoing do not apply,
the last closing bid price or last trade price, respectively, of such security in the over-the-counter market on the electronic
bulletin board for such security as reported by Bloomberg, or, if no closing bid price or last trade price, respectively, is reported
for such security by Bloomberg, the average of the bid prices, or the ask prices, respectively, of any market makers for such
security as reported in the OTC Link or “pink sheets” by OTC Markets Group Inc. (formerly Pink OTC Markets Inc.).
If the Closing Bid Price or the Closing Sale Price cannot be calculated for a security on a particular date on any of the foregoing
bases, the Closing Bid Price or the Closing Sale Price, as the case may be, of such security on such date shall be the fair market
value as mutually determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market
value of such security, then such dispute shall be resolved pursuant to Section 12. All such determinations to be appropriately
adjusted for any stock dividend, stock split, stock combination, reclassification or other similar transaction during the applicable
calculation period.

 

(h)
“Common Stock” means (i) the Company’s shares of common stock, par value $0.0001 per share, and (ii)
any capital stock into which such common stock shall have been changed or any capital stock resulting from a reclassification
of such common stock.

 

(i)
“Convertible Securities” means any stock or securities (other than Options) directly or indirectly convertible
into or exercisable or exchangeable for shares of Common Stock.

 

(j)
“Eligible Market” means the Principal Market, the NYSE American LLC, The NASDAQ Global Market, The NASDAQ Global
Select Market, The NASDAQ Capital Market or The New York Stock Exchange, Inc.

 

(k)
“Expiration Date” means the date sixty (60) months after the Issuance Date or, if such date falls on a day
other than a Business Day or on which trading does not take place on the Principal Market (a “Holiday”), the
next day that is not a Holiday.

 

    - 12 -

     

    

 

(l)
“Fundamental Transaction” means (A) that the Company shall, directly or indirectly, including through Subsidiaries,
Affiliates or otherwise, in one or more related transactions, (i) consolidate or merge with or into (whether or not the Company
is the surviving corporation) another Subject Entity, or (ii) sell, assign, transfer, convey or otherwise dispose of all or substantially
all of the properties or assets of the Company or any of its “significant subsidiaries” (as defined in Rule 1-02 of
Regulation S-X) to one or more Subject Entities, or (iii) make, or allow one or more Subject Entities to make, or allow the Company
to be subject to or have its Common Stock be subject to or party to one or more Subject Entities making, a purchase, tender or
exchange offer that is accepted by the holders of at least either (x) 50% of the outstanding shares of Common Stock, (y) 50% of
the outstanding shares of Common Stock calculated as if any shares of Common Stock held by all Subject Entities making or party
to, or Affiliated with any Subject Entities making or party to, such purchase, tender or exchange offer were not outstanding;
or (z) such number of shares of Common Stock such that all Subject Entities making or party to, or Affiliated with any Subject
Entity making or party to, such purchase, tender or exchange offer, become collectively the beneficial owners (as defined in Rule
13d-3 under the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (iv) consummate a stock purchase agreement
or other business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement)
with one or more Subject Entities whereby all such Subject Entities, individually or in the aggregate, acquire, either (x) at
least 50% of the outstanding shares of Common Stock, (y) at least 50% of the outstanding shares of Common Stock calculated as
if any shares of Common Stock held by all the Subject Entities making or party to, or Affiliated with any Subject Entity making
or party to, such stock purchase agreement or other business combination were not outstanding; or (z) such number of shares of
Common Stock such that the Subject Entities become collectively the beneficial owners (as defined in Rule 13d-3 under the 1934
Act) of at least 50% of the outstanding shares of Common Stock, or (v) reorganize, recapitalize or reclassify its shares of Common
Stock, (B) that the Company shall, directly or indirectly, including through Subsidiaries, Affiliates or otherwise, in one or
more related transactions, allow any Subject Entity individually or the Subject Entities in the aggregate to be or become the
“beneficial owner” (as defined in Rule 13d-3 under the 1934 Act), directly or indirectly, whether through acquisition,
purchase, assignment, conveyance, tender, tender offer, exchange, reduction in outstanding shares of Common Stock, merger, consolidation,
business combination, reorganization, recapitalization, spin-off, scheme of arrangement, reorganization, recapitalization or reclassification
or otherwise in any manner whatsoever, of either (x) at least 50% of the aggregate ordinary voting power represented by issued
and outstanding Common Stock, (y) at least 50% of the aggregate ordinary voting power represented by issued and outstanding Common
Stock not held by all such Subject Entities as of the Subscription Date calculated as if any shares of Common Stock held by all
such Subject Entities were not outstanding, or (z) a percentage of the aggregate ordinary voting power represented by issued and
outstanding shares of Common Stock or other equity securities of the Company sufficient to allow such Subject Entities to effect
a statutory short form merger or other transaction requiring other stockholders of the Company to surrender their shares of Common
Stock without approval of the stockholders of the Company or (C) directly or indirectly, including through Subsidiaries, Affiliates
or otherwise, in one or more related transactions, the issuance of or the entering into any other instrument or transaction structured
in a manner to circumvent, or that circumvents, the intent of this definition in which case this definition shall be construed
and implemented in a manner otherwise than in strict conformity with the terms of this definition to the extent necessary to correct
this definition or any portion of this definition which may be defective or inconsistent with the intended treatment of such instrument
or transaction.

 

(m)
“Group” means a “group” as that term is used in Section 13(d) of the 1934 Act and as defined in
Rule 13d-5 thereunder.

 

(n)
“Lead Investor” means Empery Asset Master, Ltd.

 

(o)
“Options” means any rights, warrants or options to subscribe for or purchase shares of Common Stock or Convertible
Securities.

 

(p)
“Parent Entity” of a Person means an entity that, directly or indirectly, controls the applicable Person, including
such entity whose common shares or common stock or equivalent equity security is quoted or listed on an Eligible Market (or, if
so elected by the Required Holders, any other market, exchange or quotation system), or, if there is more than one such Person
or such entity, the Person or such entity designated by the Required Holders or in the absence of such designation, such Person
or entity with the largest public market capitalization as of the date of consummation of the Fundamental Transaction.

 

(q)
“Person” means an individual, a limited liability company, a partnership, a joint venture, a corporation, a
trust, an unincorporated organization, any other entity and a government or any department or agency thereof.

 

(r)
“Principal Market” means the OTCQB.

 

    - 13 -

     

    

 

(s)
[Reserved].

 

(t)
“Required Holders” means the holders of the SPA Warrants representing at least a majority of the shares of
Common Stock underlying the SPA Warrants then outstanding and shall include the Lead Investor so long as the Lead Investor or
any of its Affiliates holds any SPA Warrants.

 

(u)
“Standard Settlement Period” means the standard settlement period, expressed in a number of Trading Days, on
the Company’s principal Eligible Market with respect to the Common Stock that is in effect on the date of receipt of an
applicable Exercise Notice.

 

(v)
“Subject Entity” means any Person, Persons or Group or any Affiliate or associate of any such Person, Persons
or Group.

 

(w)
“Successor Entity” means one or more Person or Persons (or, if so elected by the Holder, the Company or Parent
Entity) formed by, resulting from or surviving any Fundamental Transaction or one or more Person or Persons (or, if so elected
by the Holder, the Company or the Parent Entity) with which such Fundamental Transaction shall have been entered into.

 

(x)
“Trading Day” means any day on which the Common Stock is traded on the Principal Market, or, if the Principal
Market is not the principal trading market for the Common Stock, then on the principal securities exchange or securities market
on which the Common Stock is then traded.

 

(y)
“Weighted Average Price” means, for any security as of any date, the dollar volume-weighted average price for
such security on the Principal Market during the period beginning at 9:30:01 a.m., New York time (or such other time as the Principal
Market publicly announces is the official open of trading), and ending at 4:00:00 p.m., New York time (or such other time as the
Principal Market publicly announces is the official close of trading), as reported by Bloomberg through its “Volume at Price”
function or, if the foregoing does not apply, the dollar volume-weighted average price of such security in the over-the-counter
market on the electronic bulletin board for such security during the period beginning at 9:30:01 a.m., New York time (or such
other time as such market publicly announces is the official open of trading), and ending at 4:00:00 p.m., New York time (or such
other time as such market publicly announces is the official close of trading), as reported by Bloomberg, or, if no dollar volume-weighted
average price is reported for such security by Bloomberg for such hours, the average of the highest Closing Bid Price and the
lowest closing ask price of any of the market makers for such security as reported in the OTC Link or “pink sheets”
by OTC Markets Group Inc. (formerly Pink OTC Markets Inc.). If the Weighted Average Price cannot be calculated for a security
on a particular date on any of the foregoing bases, the Weighted Average Price of such security on such date shall be the fair
market value as mutually determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the
fair market value of such security, then such dispute shall be resolved pursuant to Section 12 with the term “Weighted Average
Price” being substituted for the term “Exercise Price.” All such determinations shall be appropriately adjusted
for any stock dividend, stock split, stock combination, reclassification or other similar transaction during the applicable calculation
period.

 

[Signature
Page Follows]

 

    - 14 -

     

    

 

IN
WITNESS WHEREOF, the Company has caused this Warrant to Purchase Common Stock to be duly executed as of the Issuance Date
set out above.

 

	 	ENER-CORE,
    INC.
	 	 	 
	 	By:	 
	 	Name:	Domonic
    J. Carney
	 	Title:	Chief
    Financial Officer

 

     

     

    

 

EXHIBIT
A

 

EXERCISE
NOTICE

 

TO
BE EXECUTED BY THE REGISTERED HOLDER TO EXERCISE THIS

WARRANT
TO PURCHASE COMMON STOCK

 

ENER-CORE,
inc. 

 

The
undersigned holder hereby exercises the right to purchase _________________ of the shares of Common Stock (“Warrant Shares”)
of Ener-Core, Inc., a Delaware corporation (the “Company”), evidenced by the attached Warrant to Purchase Common
Stock (the “Warrant”). Capitalized terms used herein and not otherwise defined shall have the respective meanings
set forth in the Warrant.

 

1.
Form of Exercise Price. The Holder intends that payment of the Exercise Price shall be made as:

 

____________a
“Cash Exercise” with respect to _________________ Warrant Shares; and/or

 

____________a
“Cashless Exercise” with respect to _______________ Warrant Shares.

 

2.
Payment of Exercise Price. In the event that the holder has elected a Cash Exercise with respect to some or all of the Warrant
Shares to be issued pursuant hereto, the holder shall pay the Aggregate Exercise Price in the sum of $___________________ to the
Company in accordance with the terms of the Warrant.

 

3.
Delivery of Warrant Shares. The Company shall deliver to the holder __________ Warrant Shares in accordance with the terms of
the Warrant.

 

Date:
_______________ __, ______

  

 

 

Name
of Registered Holder

 

	By:	 	 
	 	Name:	 
	 	Title:	 

  

     

     

    

  

ACKNOWLEDGMENT

 

The
Company hereby acknowledges this Exercise Notice and hereby directs VStock Transfer, LLC to issue the above indicated number of
shares of Common Stock in accordance with the Transfer Agent Instructions dated December [__], 2018 from the Company and acknowledged
and agreed to by VStock Transfer, LLC.

 

	 	ENER-CORE,
    INC.
	 	 	 
	 	By:	         
	 	Name:	 
	 	Title:Exhibit 4.3

 

FOURTH AMENDMENT TO

CONVERTIBLE
UNSECURED NOTES

 

THIS
FOURTH AMENDMENT TO CONVERTIBLE UNSECURED NOTES (this “Amendment”) is made and entered into as of December
[__], 2018 by and among Ener-Core, Inc., a Delaware corporation (the “Company”), and the undersigned, and amends
those certain Convertible Unsecured Notes dated as of September 1, 2016 (as amended, the “Notes”) as issued
by the Company pursuant to that certain Securities Purchase Agreement, dated September 1, 2016, by and among the Company, the
“Buyers” identified therein, and the Subordinated Agent identified therein (as amended to date, the “Agreement”).
Capitalized terms used herein but not otherwise defined herein shall have the meanings ascribed to such terms in the Notes.

 

RECITALS

 

WHEREAS,
pursuant to Section 13 of the Notes, the written consent of the holders of Notes representing at least a majority of the aggregate
principal amount of the Notes then outstanding (the “Required Holders”) shall be required for any change or
amendment or waiver of any provision of the Notes, provided that any such amendment or waiver does not disproportionately, materially
and adversely affect the rights and obligations of any Holder relative to the comparable rights and obligations of the other Holders;

 

WHEREAS,
any amendment effected in accordance with Section 13 of the Notes is binding upon all holders of Notes; and

 

WHEREAS,
the parties hereto wish to amend the Notes as set forth below in order to facilitate the Company’s efforts to consummate
financing activities to support working capital needs.

 

AGREEMENT

 

NOW,
THEREFORE, in consideration of the mutual covenants herein contained and other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties, intending to be legally bound, agree as follows:

 

article
i

AMENDMENTS
TO THE NOTES

 

Section
1.1 Legend. The second paragraph on the first page of the Notes is hereby amended and restated as follows:

 

“THIS
INSTRUMENT AND THE RIGHTS AND OBLIGATIONS EVIDENCED HEREBY ARE SUBORDINATE IN THE MANNER AND TO THE EXTENT SET FORTH IN THAT CERTAIN
SUBORDINATION AND INTERCREDITOR AGREEMENT, DATED AS OF SEPTEMBER 1, 2016 (AS THE SAME MAY BE AMENDED OR OTHERWISE MODIFIED FROM
TIME TO TIME PURSUANT TO THE TERMS THEREOF, THE “SUBORDINATION AGREEMENT”), BY AND AMONG LONGBOARD CAPITAL
ADVISORS LLC (THE “SUBORDINATED AGENT”), THE COMPANY (AS “BORROWER”), ENER-CORE POWER, INC.,
A DELAWARE CORPORATION (THE “GUARANTOR”), ANTHONY TANG, AS A SENIOR LENDER (AS DEFINED THEREIN) (THE “SENIOR
L/C LENDER”), AND EMPERY TAX EFFICIENT, LP IN ITS CAPACITY AS COLLATERAL AGENT (“COLLATERAL AGENT”)
FOR THE SENIOR NOTE LENDERS (AS DEFINED THEREIN) (TOGETHER WITH ITS SUCCESSORS AND ASSIGNS, THE “AGENT”), TO
THE INDEBTEDNESS (INCLUDING INTEREST) OWED BY THE CREDIT PARTIES (AS DEFINED THEREIN) PURSUANT TO THAT CERTAIN (A)(I) SECURITIES
PURCHASE AGREEMENT DATED AS OF APRIL 22, 2015, (II) SECURITIES PURCHASE AGREEMENT DATED AS OF MAY 7, 2015, (III) SECURITIES PURCHASE
AGREEMENT DATED AS OF NOVEMBER 23, 2016, (IV) SECURITIES PURCHASE AGREEMENT DATED AS SEPTEMBER 19, 2017, (V) SECURITIES PURCHASE
AGREEMENT DATED AS OF JUNE 5, 2018 AND (VI) SECURITIES PURCHASE AGREEMENT DATED AS OF DECEMBER [__], 2018, IN EACH CASE OF CLAUSES
(I), (II), (III), (IV), (V) AND (VI), BY AND AMONG BORROWER, AGENT AND THE SENIOR NOTE LENDERS AND (B) BACKSTOP SECURITY SUPPORT
AGREEMENT, DATED AS OF NOVEMBER 2, 2015, BY AND BETWEEN THE BORROWER AND SENIOR L/C LENDER, IN EACH CASE, AS AMENDED, RESTATED,
SUPPLEMENTED, REFINANCED OR OTHERWISE MODIFIED FROM TIME TO TIME; AND EACH HOLDER OF THIS INSTRUMENT, BY ITS ACCEPTANCE HEREOF,
IRREVOCABLY AGREES TO BE BOUND BY THE PROVISIONS OF THE SUBORDINATION AGREEMENT.”

 

     

     

    

 

Section
1.2 Senior Secured Notes. Section 26(z) of the Notes is hereby amended and restated as follows:

 

“Senior
Secured Notes” means (A) those certain senior secured notes issued pursuant to the Securities Purchase Agreement, dated
as of April 22, 2015 by and among the Company and the investors listed on the signature pages thereto, as amended from time to
time, (B) those certain senior secured notes issued pursuant to the Securities Purchase Agreement, dated as of May 7, 2015 by
and among the Company and the investors listed on the signature pages thereto, as amended from time to time, (C) those certain
senior secured notes issued pursuant to the Securities Purchase Agreement, dated as of November 23, 2016 by and among the Company
and the investors listed on the signature pages thereto, as amended or joined from time to time, (D) those certain senior
secured notes issued pursuant to the Securities Purchase Agreement, dated as of September 19, 2017 by and among the Company and
the investors listed on the signature pages thereto, as amended from time to time, (E) those certain senior secured notes issued
pursuant to the Securities Purchase Agreement, dated as of June 5, 2018 by and among the Company and the investors listed on the
signature pages thereto, as amended from time to time, and (F) those certain senior secured notes issued pursuant to the Securities
Purchase Agreement, dated as of January [ ] 2019 by and among the Company and the investors listed on the signature pages thereto,
as amended from time to time.”

 

ARTICLE
II

MISCELLANEOUS

 

Section
2.1 Effect of this Amendment. This Amendment shall form a part of the Agreement for all purposes, and each party thereto
and hereto shall be bound hereby. This Amendment shall only be deemed to be in full force and effect from and after both the execution
of this Amendment by the parties hereto and the execution of agreements substantially identical to this Amendment by the Company
and “Buyers” holding a sufficient number of Conversion Shares and Warrant Shares issued or issuable under the Notes
(calculated using the Assumed Conversion Price) and Warrants (without regard to any limitation on conversion or exercise set forth
therein) (as adjusted for any stock dividend, stock split, stock combination, reclassification or similar transaction occurring
after the date thereof) that, together with undersigned, constitute the Required Holders. From and after such effectiveness, any
reference to the Agreement shall be deemed to be a reference to the Agreement, as amended hereby. Except as specifically amended
as set forth herein, each term and condition of the Agreement shall continue in full force and effect.

 

Section
2.2 Entire Agreement. This Amendment, together with the Agreement, contains the entire agreement of the parties and supersedes
any prior or contemporaneous written or oral agreements between them concerning the subject matter of this Amendment.

 

Section
2.3 Governing Law. This Amendment shall be governed by the internal law of the State of New York.

 

Section
2.4 Counterparts. This Amendment may be executed in any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed an original, but all such counterparts together shall
constitute but one and the same instrument; signature pages may be detached from multiple separate counterparts and attached to
a single counterpart so that all signature pages are physically attached to the same document. This Amendment may be executed
by fax or electronic mail, in PDF format, and no party hereto may contest this Amendment’s validity solely because a signature
was faxed or otherwise sent electronically.

 

[Signature
Pages Follow]

 

    2

     

    

 

IN
WITNESS WHEREOF, the parties hereto have executed this Fourth Amendment to Convertible Unsecured Notes as of the date first
written above.

 

	 	COMPANY:
	 	 
	 	ENER-CORE,
    INC.
	 	 	 
	 	By:	 
	 	 	Name:
    Domonic J. Carney
	 	 	Title:   Chief
    Financial Officer

 

Signature
Page to Fourth Amendment to Convertible Unsecured Notes—September 2016

 

    3

     

    

 

IN
WITNESS WHEREOF, the parties hereto have executed this Fourth Amendment to Convertible Unsecured Notes as of the date first
written above.

 

	 	HOLDER:
	 	 
	 	EMPERY
    ASSET MASTER, LTD.
	 	By:
    Empery Asset Management, LP, its authorized agent
	 	 	 
	 	By:	 
	 	 	Name:
    Brett Director
	 	 	Title:
    General Counsel

 

	 	HOLDER:
	 	 
	 	EMPERY
    TAX EFFICIENT, LP
	 	By:
    Empery Asset Management, LP, its authorized agent
	 	 	 
	 	By:	 
	 	 	Name:
    Brett Director
	 	 	Title:
    General Counsel

  

	 	HOLDER:
	 	 
	 	EMPERY
    TAX EFFICIENT II, LP
	 	By:
    Empery Asset Management, LP, its authorized agent
	 	 	 
	 	By:	 
	 	 	Name:
    Brett Director
	 	 	Title:
    General Counsel

 

Signature
Page to Fourth Amendment to Convertible Unsecured Notes—September 2016

 

    4

     

    

 

IN
WITNESS WHEREOF, the parties hereto have executed this Fourth Amendment to Convertible Unsecured Notes as of the date first
written above.

 

	 	HOLDER:
	 	 
	 	BLUE
    EARTH FUND, LP
	 	 	 
	 	By:	 
	 	 	Name:
    Brett Conrad
	 	 	Title:
    Managing Member

 

Signature
Page to Fourth Amendment to Convertible Unsecured Notes—September 2016

 

    5

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