Amazon.com: UPLUS LP12-4 12 Volt 4Ah Rechargeable AGM Battery, DJW12-4.0G SLA Battery Replacement Batteries for Security Alarm System, Garage Door Opener, Ride On Truck etc. : Health & Household
DSC BD412 System Backup Battery (12 volt 4 amp)
Battery Tender 4-Amp 6/12-Volt Car Battery Charger in the Car Battery Chargers department at Lowes.com
Amazon.com: LXPVSA EnerSys Genesis NP4-12 - 12 Volt/4 Amp Hour Sealed Lead Acid Battery with 0.187 Fast-on Connector : Automotive
Yuasa Yuasa NP4-12 Battery 12 Volt 4 Amp Sealed Lead Acid Battery - 2 Pack | eBay