One of the first things you will notice if you operate your garage door opener while in battery backup mode is the garage door opener lights will not turn on.
Garage door battery lights disabled.
Use of the overhead light is temporarily disabled while in battery backup mode so that the battery backup does not waste power on anything other than lifting the door.
The reason for this is to direct all energy from the backup battery to the operation of the garage door opener.
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To save battery power the light bulbs on the garage door opener will not work when the unit is operating under battery power.