How to Change the Battery in a Key Fob

You’re walking up to your car after a long day, key fob in hand, ready to head home. You press the unlock button… and nothing happens. You try again, and again, but your car remains stubbornly locked. Your key fob battery is dead.

Don’t panic! Changing the battery in your key fob is a quick and easy process that you can often do at home with just a few simple tools.

Identifying Your Key Fob Battery

Before you can change your key fob battery, you need to know what kind of battery it uses. Most car key fobs use a small, flat, coin-shaped battery, like a CR2032 or CR2025.

Here are a few ways to find out what kind of battery your key fob needs:

Check your car’s owner’s manual. The manual will usually have a section on the key fob that lists the battery type.
Look for a small inscription on the key fob itself. Some key fobs will have the battery type printed on the back or inside the battery compartment.
Search online. A quick Google search for “[your car make and model] key fob battery” will usually give you the answer.

Gathering Your Tools

Once you know what kind of battery you need, gather the following tools:

A small flathead screwdriver or a plastic pry tool (to open the key fob)
A replacement battery (make sure it’s the correct type!)
A clean, dry cloth (to clean the battery contacts)

Changing the Battery: A Step-by-Step Guide

Ready to replace your key fob battery? Here’s a step-by-step guide:

Locate the battery compartment. This is usually on the back or side of the key fob. It might be hidden beneath a small cover or panel.
Open the battery compartment. Use your screwdriver or pry tool to gently pry open the compartment. Be careful not to damage the key fob housing.
Remove the old battery. Gently pry the old battery out of its compartment. If it’s stuck, you can use your screwdriver or pry tool to carefully lift it out.
Clean the battery contacts. Use a clean, dry cloth to gently wipe away any dirt or corrosion from the battery contacts inside the key fob.
Insert the new battery. Make sure the positive (+) side of the battery is facing up, matching the orientation of the old battery.
Close the battery compartment. Snap the compartment closed.
Test your key fob. Try locking and unlocking your car with the key fob to make sure the new battery is working.

Troubleshooting Tips

My key fob still isn’t working. If you’ve replaced the battery and your key fob still isn’t working, here are a few things to check:

Make sure the new battery is properly installed. Double-check that the battery is facing the right way.
Try cleaning the battery contacts again. Sometimes, a little extra cleaning can make a big difference.
Consult your car’s owner’s manual. There may be a reset procedure for the key fob.
If all else fails, contact your car dealer or a qualified automotive locksmith. They can diagnose the problem and provide a solution.

Key Fob Battery Replacement FAQs

How long do key fob batteries last?

Key fob batteries typically last between 3 and 5 years, depending on usage and environmental factors.

Can I replace the key fob battery myself?

Yes, in most cases, replacing the key fob battery is a simple DIY task.

What happens if my key fob battery dies while I’m driving?

Don’t worry, your car will continue to run. You just won’t be able to use the key fob’s remote functions until you replace the battery.

Can I use any type of battery in my key fob?

No, using the wrong type of battery can damage your key fob. Always refer to your owner’s manual or look for the battery type inscription on the key fob itself.

How do I know if my key fob battery is low?

Common signs of a low key fob battery include:

Reduced signal range
Dimming key fob lights
Inconsistent locking/unlocking

Need more help with your Key Fob? Check out these helpful resources:

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