Open the remote and locate the battery compartment

Most Chamberlain remotes have a battery door on the back held by a single screw or a sliding latch. Look at the back of your remote — you will see either a small Phillips-head screw or a slot where you can slide the cover down or to the side. If your remote has a screw, use a Phillips-head screwdriver to remove it. If it has a latch, push or slide it in the direction the arrow points (usually downward) until the cover comes free.

Once the cover is off, you will see the battery sitting in a plastic holder. Note which direction it faces — the positive (+) side should be facing up or toward the contact spring. Take a photo with your phone before you remove the old battery so you remember the correct orientation.

Remove the old battery and note its size

Gently lift the old battery out of the holder. Chamberlain remotes typically use either a CR2032 or CR2025 coin-cell battery — both are small, flat, and silver-colored. The number printed on the battery itself tells you which one you have. CR2032 is slightly thicker than CR2025, so using the wrong size can prevent the cover from closing properly.

If the battery is stuck, do not pry it with a metal tool. Instead, use a plastic spoon handle or the edge of a plastic card to gently work it out. Metal tools can damage the battery holder or create a short circuit.

Key Takeaways

  • Chamberlain remotes use CR2032 or CR2025 coin-cell batteries, and the correct size is printed on the old battery itself.
  • Open the battery door by removing a Phillips-head screw or sliding a plastic latch, depending on your remote model.
  • Note the battery orientation before removal so you can install the new one the same way — positive side up.
  • Replace the battery and test the remote by pressing a button before closing the cover completely.

Install the new battery with the correct orientation

Insert the new battery into the holder with the positive (+) side facing the same direction as the old one faced. Press down gently until you hear or feel a small click — the battery should sit flat and not rock side to side. If it does not sit flush, remove it and check that you are using the correct size.

Before you close the cover, press a button on the remote to test it. Point the remote at your garage door opener and press the button — you should see the light on the opener blink or hear the door move. If nothing happens, remove the battery, flip it over, and try again. Some remotes work with the battery either way, but most require the positive side to face a specific direction.

Close the battery door and find it

Once the remote works, slide the battery cover back into place. If your remote has a screw, insert it and tighten it with a Phillips-head screwdriver — do not over-tighten, as this can crack the plastic. If your remote has a latch, push or slide the cover until you hear it click and it sits flush with the back of the remote.

Test the remote one more time after closing the cover to make sure the battery contact is still good. If the remote stops working after you close the cover, the battery may not be making contact — open it again and check that the battery is sitting completely flat.

Where to buy replacement batteries

CR2032 and CR2025 batteries are sold at most drugstores, grocery stores, and hardware retailers in the watch or electronics section. They are also available online through Amazon, Walmart, and other retailers. A single battery costs between $2 and $5, and a pack of two or four costs less per battery than buying one at a time.

Buy the exact size your remote needs — do not guess. If you are unsure whether you have a CR2032 or CR2025, bring the old battery to the store and compare it to the batteries on the shelf, or check the number printed on the battery before you throw it away.

How long a new battery lasts

A fresh CR2032 or CR2025 battery in a Chamberlain remote typically lasts three to four years with normal use — pressing the button a few times per day. Heavy use, extreme heat, or a remote that is left in a hot car will shorten battery life. If your remote stops working after only a few months, the battery may be defective, or the remote itself may have a problem with the battery contacts.

If a new battery does not work, try cleaning the metal contacts inside the battery holder with a pencil eraser or a dry cloth. Dirt or corrosion on the contacts can prevent the battery from making a good connection. Rub gently and do not use water or liquid cleaners.

Troubleshooting when the remote still does not work

If the remote does not work after you install a new battery, first check that the battery is the correct size and facing the right direction. Remove it, wait 10 seconds, and reinsert it. If that does not work, try a different new battery from a different pack — the first battery may have been defective.

If a second new battery does not work, the problem is likely inside the remote itself. The circuit board may be damaged, or the button contacts may be worn out. At that point, replacing the remote is usually cheaper than repairing it. Chamberlain sells replacement remotes for most models, and universal garage door remotes from other brands often work with Chamberlain openers as well.

Frequently Asked Questions

Can I use a different battery size if I do not have the exact one?

No. CR2032 and CR2025 look similar but have different thicknesses. Using the wrong size can prevent the battery cover from closing, or it may not make proper contact with the springs inside the holder. Always use the exact size printed on your old battery.

What should I do with the old battery?

Most coin-cell batteries can be thrown in the trash, but some areas have battery recycling programs. Check your local waste management website or call your city to see if they accept batteries. If you have a Best Buy or Home Depot nearby, both accept used batteries for recycling at no cost.

Why does my remote work sometimes but not always?

A battery that works intermittently usually means the contacts are dirty or the battery is not sitting flat in the holder. Remove the battery, clean the metal contacts with a pencil eraser, and reinsert it firmly. If it still works only sometimes, the battery is likely failing and should be replaced.

Do I need to reprogram my remote after changing the battery?

No. Changing the battery does not erase the remote's programming. The remote will work when ready with the new battery. You only need to reprogram it if you replace the entire remote or if the garage door opener itself is reset.

How do I know if my remote uses a CR2032 or CR2025?

Look at the number printed directly on the old battery. It will say either CR2032 or CR2025. If the battery is too corroded to read, measure the thickness — a CR2032 is about 3.2 millimeters thick, while a CR2025 is about 2.5 millimeters thick. When in doubt, bring the old battery to a store and compare it to the batteries on the shelf.