APC BK500EI 500 VA 300 Watts Back-UPS CS 500 USB/Serial European Version - 240V 731304016359 | eBay
APC Back-UPS Back-UPS BK500EI 12V 9Ah UPS Battery - This is an AJC Brand Replacement
Powery GEL battery for UPS APC Back UPS BK500EI, 12V, 7,2Ah/86Wh, Lead Acid battery, rechargeable, 151mm x 65mm x 94mm, 100% Compatible. New|Battery Accessories| - AliExpress
APC BACK-UPS ES BK500EI 12V 7.5Ah High Rate Battery (1 Pack)