APC Replacement Battery Cartridge #115 - UPS battery - 1 x lead acid - black - for Smart-UPS X 1500 Rack/Tower LCD, 1500VA Rack/Tower LCD (APCRBC115) at TigerDirect.com
How to Replace the Battery in an APC Smart-UPS 1500 · Share Your Repair
How to Replace the Battery in an APC Smart-UPS 1500 · Share Your Repair