APC RBC Replacement Batteries are made with CSB Techology Batteries.
CSB Batteries are approved by APC for use in RBC Series of Battery packs
SUA2200RM2U, SUA3000RM2U, SUA3000RMT2U, SUM1500RMXL2U, SUM3000RMXL2U, SUM48RMXLBP2U
CSB-Battery Order # 8/HR1221WF2