The APC replacement battery cartridge no. 43 fits selected APC Smart-UPS and Back-UPS models, restoring power back-up capacity for home offices, small businesses and IT departments. This replacement battery cartridge (RBC) has a lifetime of three to five years, offers safe and reliable support to the UPS and extends the useful life of your UPS. The APC RBC no. 43 comes fully assembled and includes easy-to-follow replacement instructions, making hot-swap installation simple. APC RBCs are compliant with international regulations and safe for transport. They include instructions and reusable packaging with prepaid postage for safe disposal of old cartridges.