If you experience a loss of power, being locked out of your garage or having your car or work vehicle trapped inside the garage can be a real problem. Liftmaster has battery back-up systems for their residential and commercial garage door motors, that conveniently allow you to still come & go through your garage door even when the power goes out. When choosing the electric motor for the garage of your home or business, be sure to choose one that is compatible with a battery back-up system.