Tripp Lite RBC51 Replacement Battery Cartridge for Select Tripp Lite and Other Major UPS Brands 12-volt UPS replacement battery cartridge Compatible with a variety of UPS brands Restores or enhances runtimes of all UPS systems exhibiting reduced power failure runtime Unit Dimensions: 3.6875 x 2.5 x 5.875 This item is not for sale in Catalina Island