Garage Backup Battery in Plano, TX

battery backup

Does it need to be replaced?

Having a backup battery in your opener can be a huge lifesaver. If your power ever goes out or the power source to your opener stops functioning, the backup battery will activate allowing the opener to still function properly. If the backup battery is dead, this feature is useless. How can you tell if your battery is dead or going to die? Once the battery begins to die the opener unit will begin to beep, notifying you of the problem. Be sure to check that the beeping isn’t coming from a smoke detector or other electronic device. Once you have narrowed down the location of the beeping you are ready to replace your battery.

Where is the backup battery?

The location of the backup battery varies depending on the opener. The Liftmaster 8550 belt driven opener, for example, uses a 485LM backup battery located behind the light cover. Older models, the Jackshaft 8500, and heavy duty openers use the 475LM standby power system. The 475LM may be mounted either directly on top of the motor unit or secured on a structural support above it.

Replacing Battery Backup

Replacing the 485LM backup battery

When replacing the 485LM, disconnect the opener from the power source. Once the opener is unplugged, remove the light cover by gently pulling it away from the opener. With the light cover removed, unscrew the lightbulb giving you full access to the battery. Now, using a Philips head screwdriver, remove the plastic cover exposing the battery. Remove the old battery and discard (or we can discard of it for you). Partially insert the new battery into the motor unit with the terminals facing out. From this point, connect the red (+) and black (-) wires from the opener to the corresponding terminals on the battery. After completing those steps, replace the battery cover, lightbulb, and light cover.

Replacing the 475LM standby power system

Directly to the motor unit:

Position the 475LM directly on top of the opener with the power cord drawn out from beneath the battery, sitting firmly on top of the opener. Be sure to adjust the placement of the angle iron (the support system for the opener) so that it is out of the way of the battery installation.  Align the two screws

Secured to a structural support:

The 475LM can be mounted to either the ceiling or a wall within 3’ of the opener motor. Secure the battery in the desired position using the mounting holes on either side and the 1-1/2” lag screws provided.

Connecting the battery to the motor unit:

Before connecting your battery to the opener, be sure to unplug it from the power source. Connect the 475LM power cord to the end panel of the motor. Once the battery is connected to the opener, plug the opener back into the power source. This will allow the battery to activate causing all LED’s to turn on for 3 seconds. The green LED will flash notifying that the battery is installed properly and beginning to charge. Allow 24-48 for the battery to fully charge.

Need a backup battery?

Stop by our conveniently located showroom to replace your dead backup battery. Don’t want to do it yourself? Call our office at 972-422-1695 to schedule a time for one of our trained technicians to come out and install it for you!




By Nick McGregor, General Manager of Plano Overhead Garage Door

Backup Batteries in Plano, TX


The Battery Back-up, is a well-known product that provides homeowners with reliable garage door operation during severe weather, thunderstorms and blackouts.


Our customers in the Plano, Texas area who use a garage door opener for easy, safe and secure access to their garage and home have already found that access to their cars, as well as getting in and out of their garages, are compromised by a powerless garage door opener when there is a power failure. Not only does this cause convenience and transportation issues, it also poses a security threat to families and homeowners who depend on the garage door as the primary entrance and exit from their home.


Plano Overhead Garage Doors Battery Back-up provides reliable garage door operation in the event of electricity outages. It is compatible with the new generation of garage door openers, which combine reliability, speed and power, all with amazing quiet operation. This accessory enables an opener to operate the door at 3.5 inches per second, and, in the event of an extended loss of electricity, the unit will run up to 50 cycles in a 24-hour period after initial power outage.   It also reaches full charge within 48 hours and has front facing LEDs that indicate the charge status.

battery backup

How it works

The battery itself is located inside the unit that mounts to your ceiling.   The battery comes standard with most residential garage door openers.  Once power is lost to the home, the Battery Backup system automatically begins functioning.  Dedicated to full access and safety, the Battery Backup system on the LiftMaster garage door opener operates so all remote controls and garage door opener safety systems work normally.  Also, to notify the homeowner that the garage door opener is operating under battery power, a series of recognizable, audible sounds signal when the door is opening or closing.  As an added safety feature, a flashing LED light alerts the homeowner when the battery is charging, in use, or when the batteries need to be replaced. The battery, which has a life of roughly three-to-five years under normal use, is warranted for one year from the date of purchase to the original owner.

Rest easy!

Severe weather events are not an uncommon occurrence here in North Texas! With the help from us here at Plano Overhead Garage door, you can rest easy knowing that with electricity or not, you will always be able to open your garage door!  A battery backup can be easily installed or replaced by either a highly experienced Plano Overhead technician or the homeowner.


By Nick McGregor, General Manager of Plano Overhead Garage Door


Plano Overhead Garage Door

1100 N. Central Expy Suite #A
Plano, Texas 75074

Call Us


Mon - Fri: 8:00am - 5:30pm
Sat: 9:00am - 1:00pm