Replacing Your Garage Door Battery Backup 

Thanks for this video. This video was very helpful to me in replacing the battery in my Liftmaster because my owner's manual has no directions on how to replace the battery. The video was easy to follow. Thanks again for the great video instructions.

@0:36 - Whoa! Illegal wiring needs to be rerouted! What nimrod brought wires out from under a wall plate! LOL.

Will it work with a dead battery backup?