Mighty Max 12V 5Ah Scooter Battery Replace 4.5Ah Enduring 6FM4.5, 6 FM 4.5 | eBay
Mighty Max Battery ML5-12- 12 Volt 5 AH, F1 Terminal Rechargeable Sealed Lead Acid 1250 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com