The RB1290X8 UPS Replacement Battery Cartridge from CyberPower will revitalize your OL8KRTHD or OL10KRTHD UPS systems. This cartridge can be swapped into your existing UPS if the battery systems are weak or completely depleted. The RB1290X8 contains eight 12V/9Ah lead-acid batteries inside a maintenance-free, leakproof case—ensuring a clean, easy transition between cartridges.