APC APC BackUPS 6 Outlets 450VA 255W 6-Outlet 180 Joules 255-Watt 450Va Indoor AC Surge Protector with Battery Backup in the Surge Protectors department at Lowes.com
12V 9Ah UPS Battery Replacement for APC BE550G - MightyMaxBattery
MIGHTY MAX BATTERY ML7-12 - 12V 7.2AH Replacement UPS Battery for APC BE500U MAX3422462 - The Home Depot
Replacing the Battery Module in a SMT Series APC Smart-UPS | Schneider Electric Support - YouTube