Amazon.com: 12V 7.2AH SLA Battery Replaces APC Back-UPS ES 650 : Health & Household
MIGHTY MAX BATTERY 12V 7AH compatible replacement battery for APC Back-UPS 550 BE550G ML7-12191111111101111135 - The Home Depot
APC Back-UPS CS 650VA 230V For International Use - 650VA/400W - 11.4 Minute Full Load - 3 x IEC 320-C13 - Battery/Surge-protected, 2 x - Battery/Surge-protected, 1 x IEC 320-C13 - Surge-protected - Filo CleanTech