When the battery is fully charged the green light will stop blinking.
Liftmaster garage door battery beeping.
Here are a few reasons why your garage door opener might be beeping.
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.
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.
To test the battery unplug your door opener and activate it using the door control or remote control.
Backup batteries open and close your garage door when the power is out and last 2 3 years under normal use.