This UPS backup battery replacement is carefully screened and certified to meet or exceed original specifications. The leakproof, no-maintenance RBCSUT comes pre-assembled and pre-wired as four 12V, 9Ah batteries for quick and easy installation in your SUT20K, SUT30K, SUT40K or SUT60K UPS. It functions within a wide range of operating temperatures. A sensor automatically informs the UPS that the battery has been replaced, so the UPS can reset the battery age. Each SUT models requires a different number of RBCSUT cartridges, please consult the SUT UPS owners manual or the RBCSUT owner's manuals posted on the RBCSUT site.