APCRBC140 Replacement Battery Cartridge For Use With Denser Server and Networking. The APC battery pack of 960VAh is a replacement battery cartridge. It has two maintenance-free sealed Lead-Acid batteries with suspended electrolyte. This replacement battery cartridge (RBC) offers safe and reliable support to the UPS and extends its life. The device comes fully assembled and includes easy-to-follow replacement instructions, making hot-swap installation simple. APC RBCs are compliant with international regulations and are safe for transport.