Amazon.com: Yuasa NPH5-12 12V 5Ah UPS Battery - This is an AJC Brand® Replacement : Electronics
12V 5AH Battery Replacement for Digital Security Power832 - 9 Pack - Walmart.com
Mighty Max Battery ML5-12- 12V 5AH Alarm System Back Up Vista 20P ADT Rechargeable Sealed Lead Acid 1250 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com