Cartridge #6 (RBC6). Battery Type: Sealed Lead-Acid; Battery Size: RBC6; For Use With: APC® BP1000, BP1000I, BP1100, APC10IA, DLA1500J, NECA1000JW, SU1000, SU1000BX120, SU1000I, SU1000INET, SU1000NET, SU1000RM, SU1000RMI, SU1000RMINET, SU1000RMENT, SU1000