Replacement Battery for APC Back UPS ES 350 Genuine ExpertPower Battery - The Most Trusted And Highest Reviewed Sealed Lead Acid Batteries Battery Type - 12 Volt 3.3 Amp 20 Hour Sealed Lead Acid Battery With F1 Terminals Battery Dimensions - 5.28 in (length) x 2.38 in (width) x 2.64 in (depth); Weight - 2.9 lbs. Compatibility - The EXP1233 Is Compatible With APC Back-UPS ES 350, BE350E, BE350C, BE350R, and BE350U. User Friendly - Items Arrive Fully Charged And Make For A Simple, Plug and Play Installation