APC Lithium Ion Replacement Battery Cartridge #173 LI

"User replaceable battery Internal lithium-ion battery fits Smart-UPS Ultra 1U UPS 3x the life of a lead acid battery Standard warranty 5 years repair or replace APC Smart-UPS Ultra Lithium-ion 1U External Battery Pack for extended runtime on Smart-UPS Ultra 3kW systems. Up to 10 external batteries can be connected. Battery Voltage 50 V"