The genuine APC Replacement Battery Cartridge (RBC) is tested and certified for 100% compatibility to the the specific APC UPS. This lead-acid RBC has a lifetime of three to five years which offers reliable support and extends the useful life of your UPS. The APC RBC comes fully assembled and ready for use. To see the compatible UPS list, please click "View Compatible UPS Models"button in "Get Support" Section at APC.com