AMERICAN POWER CONVERSION CORP SRT48RMBP APC Smart-UPS SRT 48V 1kVA and 1.5kVA RM Battery Pack - Battery enclosure (rack-mountable / external) - 2 x battery - lead acid - 2U - black - for P/N: AR3003, AR3003SP, AR3006, AR3006SP, AR3103, AR3103SP, AR3