Skip the auto shop - Our mechanics make house calls

How to Replace a Key Fob Battery

key fob

Key fobs make it easier to get into vehicles. Opening the doors and the trunk or tailgate are easier than ever with this device. Some are separate from the key and others have the key built right in. Others are called “smart keys” where you don’t even have to take the fob out of your pocket to open the doors, trunk, or even start the car. The battery is only there for the fob to control remote functions. The battery being weak or dead does not prevent you from starting your vehicle, only from using the fob itself. Replacing the battery is easy and they can be found at any auto part store, supermarket, or pharmacy.

Part 1 of 1: Replacing the battery

Materials needed

opening key fob with a screwdriver

Step 1: Open your key fob. Generally, all you need to open up your key fob is a strong fingernail. If that doesn’t work, use a small flat head screwdriver to gently pry it open.

To avoid breaking the key fob shell, pry gently from more than one location around the fob.

  • Note: Some all-in-one key fob/key combinations require you to split the remote from the key first as pictured below. Battery replacement procedure is the same.

all in one key fob with battery shown

Step 2: Identify your battery. Now that you have the fob opened, if you have not already purchased the replacement battery, you can now see the battery type/number printed on the battery and purchase one.

Note the battery + and - position as some fobs may not have the labeling inside.

key fob battery and location

Step 3: Replace the battery. Insert the battery in the proper position.

Gently snap the fob shell back together, making sure it snaps together completely.

Try all the remote buttons to verify it is working.

By noticing the signs that your key fob is giving you, it will be easy to replace the battery and restore its functionality. Make sure that a high-quality replacement battery is replaced correctly or just have an experienced mechanic, like one from YourMechanic, inspect and replace the key fob battery for you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...


Related questions

Q: Everything turns on, but when I turn my key, the car won't turn on

Hi there. There are a few things that instantly come to mind that could be causing your starting issues. If you can activate all of your accessories but nothing happens when you turn the key forward, the cause is most...

Q: Key cannot turn all the way, car cannot be started - 1993 Mercedes-Benz 300SE

Hello. I would first check and see if the shifter is moving correctly. If it is not going fully into park then this will occur. If it is, then the ignition switch may be binding. I would move the shifter...

Q: Do I need to get a new battery when my alternator dies?

I would recommend having your battery tested. When your alternator goes bad, that means your battery has been charging regularly. Irregular charging can decrease the life of a battery. Since you can't get the car going, I would recommend having...