Exhibit 10.12(b) MARVIN I. HAAS 91 CENTRAL PARK WEST NEW YORK, NEW YORK 10023 October 18, 2006 Board of Directors Universal Power Group, Inc. 1720 Hayden Road Carrollton, Texas 75006 Dear Sirs: This letter confirms my acceptance of your offer to join the Board of Directors of Universal Power Group, Inc. immediately upon effectiveness of the company's initial public offering. Very truly yours, /s/ Marvin I. Haas Marvin I. Haas