APC UPS Battery Replacement RBC17 for APC Models (APC Original Battery 9AH/ 12V) - BK Technologies
APC RBC124 Upgraded 12V 9Ah Battery (1 Pack)
APC BACK-UPS ES 500VA BE500U Battery Replacement - UB1290 Universal Sealed Lead Acid Battery (12V, 9Ah, 9000mAh, F1 Terminal, AGM, SLA) - Includes TWO F1 to F2 Terminal Adapters - Walmart.com