PC Express - APC Power-Saving Back-UPS Pro 550 BR550GI Now... | Facebook
Powery GEL battery for UPS APC Power Saving Back-UPS Pro 550 9Ah 12V, 12V, 9Ah/108Wh, Lead-Acid battery, rechargeable, 151mm x 65mm x 94mm, 100% Compatible. New - AliExpress Consumer Electronics
APC UPS Pro 550 POWER KINGDOM Battery Replacement - YouTube