Mighty Max Battery 12V 9Ah UPS Battery Replacement for APC BE550G Rechargeable Sealed Lead Acid 1290 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
2x 12V 9Ah Sealed Lead Acid Battery For APC BACK-UPS 1500 XS1500 UB1290 | eBay
APC Back-UPS RS BR1500G UPS Battery Set Replacement of 2 - 12V 9Ah | eBay
MIGHTY MAX BATTERY 12V 9Ah SLA Battery Replacement for APC Smart UPS RM 1500 2U - 8 Pack MAX3828712 - The Home Depot
Amazon.com: Replacement for APC Back-UPS 600 BN600 Battery - Replacement UB1290 Universal Sealed Lead Acid Battery (12V, 9Ah, 9000mAh, F1 Terminal, AGM, SLA) - Includes Two F1 to F2 Terminal Adapters :
Continental Replacement Battery for APC BX1000G 12V 9AH F2 UPS
APC RBC32 (12V 9AH Version) UPS Battery Set (Replacement)