Mighty Max Battery 12V 18AH INT Thread for BP17-12 GP12170 ES17-12 Rechargeable Sealed Lead Acid 12180 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
MIGHTY MAX BATTERY 12-Volt 18 Ah Sealed Lead Acid (SLA) Rechargeable Battery ML18-12 - The Home Depot
Mighty Max 12V 9AH SLA Battery Replacement for SEL HYS1290 | eBay