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.

Installation Manual
Mighty Mule Warranty Information
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The Battery Warmer Is Very Safe and Easy To Install
Helps Keep Your Gate Opener Running Through The Cold Winter Months
Extends The Life of The 12 Volt Gate Opener Battery By Maintaining a Constant Warm Temperature
Backed By The Mighty Mule 12 Month Warranty