Tripp Lite's RBC51 premium UPS replacement battery cartridge breathes new life into UPS systems suffering from expired or weak internal batteries. Like every Tripp Lite battery cartridge, it is carefully screened and certified to meet or exceed original manufacturer specifications and ships ready for installation in your UPS system. Its reusable packaging holds expired batteries for recycling center delivery. The RBC51 is compatible with a wide variety of UPS systems, including select models from Tripp Lite, APC, Belkin, Best, Powerware, Liebert and more.