Mighty Max Battery 12V 8Ah for APC Back-UPS CS 500, BK500, BK500BLK Rechargeable Sealed Lead Acid 1280 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Apc Back-ups Cs 500 - Ups - Ac 120 V - 300 Watt - 500 Va - Output Connectors: 6 - Black - For P/n: Ar106sh4, Ar106sh6, Ar109sh4, Ar109sh6, Ar112sh4, Ar112sh6, Scl500rm1unc - Walmart.com