Replacement Battery - Compatible with APC Back-UPS ES 550VA UPGRADE TO 8AH AND RECEIVE 15% LONGER RUN TIME DIRECT REPLACEMENT FOR APC Back-UPS ES 550 (including ES 500 and 650 and BE550R) EXACT SAME SIZE - 5.94" x 2.56" x 3.74" ; 5 pounds Battery Life 3-5 Years Under Normal Conditions Correct F2 terminals, 2 Year Warranty!