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
Bright Way Replacement Battery for APC Smart-UPS 1000XL 12V 18Ah NB UPS
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SUA1000XL - APC Smart-UPS XL 1000VA 800W USB & Serial Tower Refurbished - 1 Year Warranty
How to replace the battery on the APC 1000XL Battery Backup - YouTube
APC Smart-UPS 1000XL (SU1000XL) replacement battery (rechargeable, high rate)