AMENDMENT TO
SUBSCRIPTION AND INVESTMENT AGREEMENT

This
Amendment is dated as of January 31, 2004 and amends the Subscription and Investment
Agreement dated as of July 25, 2003 between ITOCHU Corporation and Ener1, Inc. (the
Investment Agreement).

Whereas,
Section 2.A. of the Investment Agreement provided ITOCHU with options, exercisable during
the first six months from the date of the Investment Agreement, to purchase shares of
Ener1 common stock equal to up to 4%, in the aggregate, of Ener1s total outstanding
common stock, calculated as of the date immediately prior to the date of the Investment
Agreement, at the price of US$0.70 per share (the Section 2.A. Options); and

Whereas,
Section 2.B. of the Investment Agreement provided ITOCHU with options, exercisable during
the second six months from the date of the Investment Agreement, to purchase shares of
Ener1 common stock equal to up to 3%, in the aggregate, of Ener1s total outstanding
common stock, calculated as of the date immediately prior to the date of the Investment
Agreement, at the price of US$2.50 per share (the Section 2.B. Options); and

Whereas,
Ener1 has issued convertible debentures to other investors that require, among other
things, that Ener1 include the debentures and underlying shares of Ener1 common stock into
which they are convertible in a registration statement to be filed by Ener1 within 45 days
of issuance of the debentures (the Registration Statement).

Whereas,
ITOCHU and Ener1 have reached certain agreements regarding the exercise by ITOCHU of the
Section 2.A. Options, extension of the term and increase of the exercise price for the
Section 2.B. Options and amendment of Section 7 of the Investment Agreement regarding
inclusion of ITOCHUs shares in registration statements for Ener1 common stock.

Now,
therefore, in consideration of the premises, the conditions and covenants herein, and for
other good and valuable consideration, the receipt and sufficiency of which is hereby
acknowledge, ITOCHU and Ener1 hereby agree as follows:

1.       
          Ener1 acknowledges and agrees that ITOCHU has timely exercised in writing its
          options to purchase 1,500,000 shares of Ener1 common stock, pursuant to Section
          2.A. of the Investment Agreement and made full payment therefor, and Ener1 shall
          promptly cause its transfer agent to deliver a certificate for said shares to
          ITOCHU. The certificate will be marked with the restrictive legend required by
          Section 4.C. of the Investment Agreement. ITOCHU acknowledges that all of the
          Section 2.A. options, other than the 1,500,000 exercised by ITOCHU, terminated
          on January 25, 2004.

2.       
          The exercise period for all of the Section 2.B. Options is extended to January
          31, 2005, and the exercise price for all of the Section 2.B. Options is changed
          to US$4.00 per share.

3.       
          Ener1 shall not be required to include in the Registration Statement any of the
          14,000,000 shares of Ener1 common stock initially purchased by ITOCHU under the
          Investment Agreement. ITOCHU shall have the right, subsequent to the effective
          date of the Registration Statement, to require Ener1 to file a registration
          statement with the U.S. Securities and Exchange Commission to register some or
          all of the 14,000,000 shares originally purchased by ITOCHU under the Investment
          Agreement. In addition, Ener1 shall include in the Registration Statement the
          1,500,000 shares of Ener1 common stock purchased by ITOCHU through exercise of
          its Section 2.A. Options.

4.       
          All other terms and conditions of the Investment Agreement remain in full force
          and effect except as changed by this Amendment or the terms of the Investment
          Agreement.

Wherefore,
ITOCHU and Ener1 have caused their respective authorized officials to execute this
Amendment as of the date first set forth above.

|Ener1, Inc.                             
By:      __________________             
Name:    Ronald N. Stewart              
Title:   Executive Vice President,      
           General Counsel and Secretary | ITOCHU Corporation
By:      ___________________
Name:    ___________________
Title:   ___________________
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