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
Sealed lead acid battery 12V UPS replacement 9ah - Cablematic
Best Power BAT 12V 9Ah UPS Replacement Battery: BatteryClerk.com UPS
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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