The battery is located on the right side of the door opener power head mounted in the ceiling as you stand under it looking out towards the driveway inside the lens cover behind the light bulb when you pull down the light cover and remove the light bulb you will see the compartment door as it has the 1 4 screw.
Liftmaster garage door battery beeping.
When the battery is fully charged the green light will stop blinking.
Replace the backup battery may 15 2017 if your garage door opener is beeping every 30 seconds you most likely need to replace the backup battery in your automatic opener.
Backup batteries open and close your garage door when the power is out and last 2 3 years under normal use.
If you re using a liftmaster timer to close or other similar technology the garage door opener will beep to indicate when the door is closing.
So if you only hear beeping when you re shutting your garage door that s normal.
Here are a few reasons why your garage door opener might be beeping.