UPG General Purpose Deep Cycle AGM Rechargeable Sealed Lead Acid 645 Alarm System Batteries in the Device Replacement Batteries department at Lowes.com
6 Volt 4AH Rechargeable Sealed Lead Acid SLA Battery 6 volt 4amp - 2 Pack - Walmart.com
Amazon.com: Universal Power Group UPG UB645 6V 4.5AH SLA Sealed Lead Acid Battery - also Compatible with Kid Trax Disney Ride on Toy KT1123TR : Automotive
Toyo SLA4-6 Alarm Medical UPS Replacement Battery 6 volt 4.5 Ah
2) 6V 4AH POWER STAR PS4-6 SLA BATTERY - NOW 5AH UPGRADE | eBay