This guide explains how to replace the battery backup in LiftMaster or Chamberlain garage door openers. For instructions on replacing the battery in your garage door opener remote, click here.

Tools Required:

• Step stool or ladder tall enough to access the opener’s motor unit
• Phillips screwdriver
• Pliers

Step 1: Prepare the Work Area and Locate Your Garage Door Opener Battery

1. Prepare the Area: Ensure your garage door opener is easily accessible. Clear any obstructions or, if necessary, move vehicles out of the garage.
2. Locate the Battery Backup: For ceiling-mounted openers, the battery backup is inside a compartment on the side opposite the antenna. For side-mounted openers, the battery compartment is at the front, facing you.
3. Unplug the Opener: Disconnect your garage door opener from the electrical outlet for safety.

Step 2: Access and Remove the Battery

1. Use a Phillips screwdriver to remove the screw securing the compartment panel.
2. Take off the panel to reveal the battery.
3. Gently use pliers to disconnect the wires from the battery terminals. If the connections are stuck, carefully wiggle them to avoid damaging the wires or terminals.

Step 4: Install the New Battery

1. Partially insert the replacement battery into the compartment.
2. Connect the red (+) and black (-) wires to the corresponding terminals on the replacement battery.
3. Fully insert the battery into the compartment and reattach the panel.
4. Tighten the panel screw using a Phillips screwdriver.

Step 5: Charge and Test the Battery

1. Plug your garage door opener into the outlet to begin charging the backup battery.
2. Allow 24 hours for the battery to be fully charged.
3. After 24 hours, unplug the opener and test its operation to confirm the new battery is functioning properly.

What Battery Do You Need for Your Garage Door Opener?

The recommended replacement battery backup for your garage door opener is the LiftMaster 485LM or Chamberlain 41A6357-1. Both models are essentially identical.

Key Details:

• Lifespan: The battery typically lasts 1 to 3 years under normal usage conditions.
• Maximizing Battery Life: To extend the life of your backup battery, disconnect it if the garage door opener will not be used for an extended period.
• Power Supply: Once fully charged, the backup battery provides 12Vdc power to your garage door opener, enabling normal operation during a power outage for approximately one to two days.