REVOLVING CREDIT NOTE
On or before the Maturity Date, FOR VALUE RECEIVED, Quantum Fuel Systems Technologies Worldwide, Inc., a
Delaware corporation (the “ Company ”), promises to pay to the order of WB QT, LLC, a Delaware limited liability company (“
Lender ”) at Minneapolis, Minnesota, care of the Agent in lawful money of the United States of America so much of the sum of
Twenty Million Six Hundred Thirty-Seven Thousand Five Hundred Dollars ($20,637,500), as may from time to time have been
advanced by Lender to the Company and then be outstanding hereunder pursuant to the Credit Agreement dated as of
January 31, 2007 made by and among the Company and certain lenders signatory thereto, including the Lender, and WB QT,
LLC as Agent for such lenders, as the same may be amended or otherwise modified from time to time (“ Credit Agreement ”),
together with interest thereon as hereinafter set forth.
Each of the Revolving Credit Advances made hereunder shall bear interest at the interest rate from time to time applicable
thereto under the Credit Agreement or as otherwise determined thereunder, and interest shall be computed, assessed and
payable as set forth in the Credit Agreement.
This Note is a Revolving Credit Note under which Revolving Credit Advances, repayments and readvances may be made
from time to time, by Lender, but only in accordance with the terms and conditions of the Credit Agreement. This Note
evidences borrowings under, is subject to, is secured in accordance with, and may be accelerated or prepaid under, the terms of
the Credit Agreement to which reference is hereby made. Capitalized terms used herein, except as defined to the contrary, shall
have the meanings given them in the Credit Agreement.
This Note shall be interpreted and the rights of the parties hereunder shall be determined under the laws of, and
enforceable in, the State of Minnesota.
Company hereby waives presentment for payment, demand, protest and notice of dishonor and nonpayment of this Note