Replace Batteries In 371LM and 373LM 3-Button Remote Controls. Pry open the case with the visor clip or screwdriver. Remove the old battery. Dispose of old batteries properly. Insert the replacement battery positive side up (+). Replace the battery with only a 3V CR2032 coin cell battery. Replace the cover.
If your garage door opener operates via remote control, you can remove the old batteries by simply sliding the door located at the back of the remote control.
This DIY repair guide explains how to replace the back-up battery in a garage door opener. Located in the motor unit, the battery supplies power to the opener if
3 Replacement Batteries For Liftmaster 371LM Garage Door Remote – – Amazon.
I called the garage door company that installed my Lift Master and they. I have an 11 year old battery back-up (BBU) and I did replace the batteries once before