Replacement UPS battery cartridge APCRBC123-SLA123 for APC SMT750RM2UC SMT750RM2UNC SMT750R2X122 BX1350M BN1250G BR1000G BX1000G BX1000G-CA BX1300G BX1300G-CA SMT750RM2U SMT750RMI2U replaces APCRBC123 RBC123