BTI Replacement Battery #133 for APC - UPS battery (equivalent to APCRBC133 SMT1500RM2UNC, SMT1500R2X122, SMT1500R2-NMC, SMT1500RMUS, SMT1500RM2U, SMT1500RMI2U) - 1 x - for SMT1500RM2U, SMT1500RM2UTW, SMT1500RMI2U, SMT1500RMUS.