Mighty Max Battery 12V 12AH F2 DEEP-CYCLE RECHARGEABLE BATTERY Rechargeable Sealed Lead Acid 12120 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
JC640 Battery Replacement, also replaces Jolt JP640, and Portalac PE6-4 Models | eBay
Amazon.com: Portalac TEV12360 12V 35Ah UPS Battery - This is an AJC Brand Replacement : Health & Household