APC Smart-UPS 1000VA USB SER SUA1000RM2U 12V 7Ah 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