The FM150 is the replacement battery for the following Mighty Mule gate openers: FM500/502, FM700/702, MM-SL1000B, and MM-SL2000B.  Each battery is 12 Volt, 7 amp-hour. This maintenance-free battery is the only battery approved for use with the gate operators listed. Life expectancy is 2-3 years.
(NOT for use with Mighty Mule FM250)

12-Volt, 7 amp-hour Replacement Battery
Compact, can fit easily inside standard control boxes
Approved for use with the FM500, FM502, and PRO models, not the 200, 250, 350, 352.
Not for use with Mighty Mule FM250 or FM350 automatic gate openers
Comes with 12 month limited warranty