APC RBC Replacement Batteries are made with CSB Techology Batteries.
CSB Batteries are approved by APC for use in RBC Series of Battery packs
SURT7500XLT (2 reqd), SURT8000RMXLT (2 reqd), SURT8000XLT (2 reqd), SURTA3000XL, SURTD3000RMXLT, SURTD3000XLT, SURTD5000RMXLT, SURTD5000XLT
csb-battery.ca order # 16/HR1221WF2