Tripp Lite RBC36H UPS battery 12 V 3.6 Ah

UPS Replacement Battery Cartridge for Select UPS Systems
This UPS backup battery replacement is designed for these specific battery-door enabled versions of AVR550U, AVRX550U, ECO550UPS, ECO650UM, INTERNET550SER, INTERNET550U and INTERNET600U that originally shipped with a 12V 3.6Ah battery inside. It is carefully screened and certified to meet or exceed original runtime specifications. The leakproof, no-maintenance RBC36H comes ready for quick and easy installation in your UPS system. It functions within a wide range of operating temperatures. Reusable packaging allows you to easily send expired batteries to a recycling center.