APC Back-UPS Pro 1000VA BX1000M Replacement Battery - 100% Compatible
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
How To Replace & Upgrade Your APC Smart UPS Battery
APC Smart UPS 1000 - Dead Battery Replacement - YouTube