Mighty Max Battery 12 VOLT 22 AH GEL BATTERY- 2 PACK Rechargeable Sealed Gel 12220 Backup Power Batteries (2-Pack) in the Device Replacement Batteries department at Lowes.com
Exodus Pro HLE22-12 booster battery replacement
Amazon.com: 12V 22AH SLA Battery Replacement for Exodus HLE22-12 : Health & Household