The APC APCRBC124 replacement battery cartridge #124 fits selected APC Smart-UPS and backups, restoring power backup capacity for home offices, small businesses and IT departments. This replacement battery cartridge (RBC) has a lifetime of 3 – 5 yr, offers safe and reliable support to the UPS, and extends the useful life of your UPS. The APC RBC #124 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. Prepaid postage and reusable packaging provided for safe disposal of old cartridges.