APC SU420VS Battery Replacement also fits: SUVS420I
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Amazon.com: APC UPS Battery Backup and Surge Protector, 600VA Backup Battery Power Supply, BE600M1 Back-UPS with USB Charger Port : Electronics
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How to Replace Batteries in APC Smart-UPS 1000 · Share Your Repair
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When your APC #UPS is flashing green with a beep every second, it's supplying battery power to the backup outlets and has approximately 2 minutes runtime... | By APC by Schneider Electric | Facebook
APC Smart-UPS 1400 Rackmount Uninterruptible Power Supply SU1400RM2U N
How to troubleshoot "Replace Battery LED flashing" on a Smart-UPS - YouTube