Mighty Max Battery 12V 18AH Battery for Champion Generator 9000 7000 Rechargeable Sealed Lead Acid 12180 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Amazon.com : 12V 18AH Sealed Lead Acid Battery Replacement for FM12180 : Sports & Outdoors
Chrome Battery 12V 18Ah Sealed Lead Acid Battery for AGM - Walmart.com