Replacement battery for SU2200RM3U, SU2200RMI3U, SU3000RM3U, SU3000RMI3U. Replacement Battery Cartridges (RBCs) are user replaceable and hot swappable. Each RBC is a complete set of tested and charged batteries for your APC UPS. With the purchase of each RBC, you will also get Free Freight back to APC for the disposal of your used batteries in the US.