APC Back-UPS Pro 1500VA 10-Outlet/2-USB Battery Back-Up and Surge Protector Black BN1500M2 - Best Buy
How To Replace & Upgrade Your APC Smart UPS Battery
APC Smart-UPS 1500 Rack Mount XL 2U (SUM1500RMXL2U) - Brand New Compatible Replacement Battery Kit | RefurbUPS
Amazon.com: RBC7-UPC Replacement Battery for APC Smart-UPS SU1400, SUA1500, SUA750XL, SUA1000XL, SU1400NET, SU1000XLNET - Scroll Down for The Complete List of Compatible Models : Electronics