UPG General Purpose Deep Cycle AGM Rechargeable Sealed Lead Acid 645 Alarm System Batteries in the Device Replacement Batteries department at Lowes.com
Amazon.com: Casil 6V 4Ah Replacement Battery Compatible with JohnLite cy-0112-6.40 Spotlight : Health & Household
Johnlite 6v 4ah 20hr Battery Equivalent –
JohnLite KW-0006 6V 4.5Ah Light Battery (8 Pack)
Toyo SLA4-6 Alarm Medical UPS Replacement Battery 6 volt 4.5 Ah