Amazon.com: 12V 7.2Ah UPS Replacement Battery for APC ES500, ES550, LS500, RBC110, RBC2 by UPSBatteryCenter® : Health & Household
RBC110 UPS Replacement Battery for APC APCRBC110
Amazon.com: RBC110 Compatible Battery Replacement for APC RBC110 by UPSBatteryCenter : Electronics
Mighty Max Battery 12V8AH for ES500 ES550 ES750G LS500 RBC110 PX12072 Rechargeable Sealed Lead Acid 1280 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Continental Replacement Battery for SLA Battery 12V 7AH F1 Terminal for APC ES500, ES550, LS500, RBC110, RBC2