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 Batteries on an APC 1400XL Rack Mount UPS with Wiring Diagram - YouTube
How to replace an APC Smart-UPS rack mount battery