MIGHTY MAX BATTERY 12V 18AH SLA INT Battery Replaces 6fm17 6-dzm-20 6-fm-18 - 4 Pack MAX3972458 - The Home Depot
MIGHTY MAX BATTERY 12V 22AH GEL Battery Replaces 51814 6fm17 6-dzm-20 6-fm- 18 - 2 Pack MAX3533874 - The Home Depot
Mighty Max Battery 12V 18AH SLA Battery for Enduring 6FM18, 6-FM-18 Rechargeable Sealed Lead Acid 12180 Backup Power Batteries in the Device Replacement Batteries department at Lowes.com
Dynavolt 6-FM-18 Battery - Replacement Battery for the Dynavolt 6-FM-18 Battery $34.00