How to Replace a Key Fob Battery

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

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

Related articles

How to React If Your Battery Light is On
The battery light or charging warning light (https://www.yourmechanic.com/article/the-check-engine-light-demystified), available on the dashboard of your car, indicates malfunctioning or poor charging of the battery....
Electric Cars and How They Work
Electric cars use an electric motor driven by a control unit. Their batteries are filled at charging stations and they produce no tailpipe emissions.
How to Replace a Car Battery Temperature Sensor
The battery has a battery temperature sensor that can fail if the Check Engine Light comes on, the battery voltage is low, or the RPM curve surges.

Related questions

Car stalling after a only few minutes
The alternator may not be charging even though it is remanufactured. The charging system main fuses may also be blown and would need to be checked. I recommend you have a mechanic, like ones from YourMechanic, come by and inspect...
The battery light and the emergency brake light illuminate when I turn on the car. The car shakes when they are on.
Hello and thank you for your question. Check your alternator for voltage at low idle and when the engine is at 3,000 rpm. It sounds like the alternator is not producing enough voltage at a low rpm. The battery light...
Amber engine light came on seemed to lose power. 2014 LR2 ,HSE 4 cyl turbo charged
The brakes will need to have them inspected to see if they need replaced. The check engine light coming on and loss of power will not be due to brake pads are low. You will need to have the computer...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com