Replacement Battery Heater for Mighty Mule FM600 (Not Solar Compatible for DC Operators).

The Battery Heater helps keep gate opener batteries warm in cold climates. This heater is recommended where outside temperatures stay below 32 degrees F for an extended period of time. The Battery Warmer is very safe and easy to install, and it wires into the gate opener circuit board to maintain a constant temperature.  It attaches directly to the gate opener's 12 Volt battery, and will prevent the battery from losing its charge in cold temperatures, not solar compatible.