MIGHTY MAX BATTERY 12V 18Ah Compatible for RBC7 SU1400 SUA1500 SU700 APC Cartridge UPS MAX3482580 - The Home Depot
Amazon.com: UPC UPGRADE PARTS COMPANY RBC7-UPC Replacement Battery for APC Smart-UPS SU1400, SUA1500, SUA750XL, SUA1000XL, SU1400NET, SU1000XLNET - Scroll Down for The Complete List of Compatible Models : Electronics
Amazon.com: APC UPS Battery Replacement, RBC7, for APC Smart-UPS Models SMT1500, SMT1500C, SMT1500US, SUA1500, SUA1500US, SUA750XL and select others, Black,1 Count (Pack of 1) : Electronics