Mighty Max Battery 12 VOLT 18 AH GEL BATTERY- 2 Pack Rechargeable Sealed Gel 12180 Backup Power Batteries (2-Pack) in the Device Replacement Batteries department at Lowes.com
Battery - SLA1116 - 12 volt 18 amp – Golden Technologies Dealer
Amazon.com: ExpertPower 12 Volt 18 Ah Rechargeable Battery With Nuts & Bolts Included || EXP12180 : Automotive