APC Smart-UPS XL Battery Pack Tower/Rack Convertible 48V, rackmount with kit, 5U - APC USA
APC BY SCHNEIDER ELECTRIC Replacement UPS Battery For Mfr. No. SUM1500RMXL2U, SMT2200RM2U, SMT3000RM2U, SUM3000RMXL2U, 48V DC - 426P04|RBC43 - Grainger
Amazon.com: APC Smart-UPS 2200XL SU2200XL 12V 18Ah UPS Battery - This is an AJC Brand Replacement : Electronics
APC Smart-UPS 2200XL replacement battery pack (rechargeable, high rate)