CyberPower RB1270X4E Replacement Battery Cartridge, Maintenance-Free, User Installable Certified OEM replacement battery for CyberPower UPS Maintenance-Free. Leak proof sealed lead acid battery Reusable package for delivering expired batteries to a suitable recycling center User Installable. Pre-assembled for easy installation. Compatibility: CPS1500AVR (With serial numbers beginning with 'BB') 18 Month Warranty