Mighty Max Battery ML5-12- 12 VOLT 5 AH SLA BATTERY- PACK OF 4 Rechargeable Sealed Lead Acid 1250 Alarm System Batteries (4-Pack) in the Device Replacement Batteries department at Lowes.com
6V 4.5Ah SLA Battery | Jaycar Electronics
UPG 6-Volt 4.5 Ah Sealed Lead Acid (SLA) AGM Rechargeable Battery UB645 - The Home Depot
Amazon.com: ML4-6 - 6 Volt 4.5 AH, F1 Terminal, Rechargeable SLA AGM Battery : Automotive