A Step-by-Step Guide – How to Replace Your Key Fob Battery

how to replace key fob battery


Key fobs have become an integral part of our daily lives, providing us with the convenience of unlocking and starting our cars with the push of a button. However, like all batteries, key fob batteries eventually run out of power. Fortunately, replacing a key fob battery is a straightforward process that you can do yourself, saving time and money. In this guide, we’ll walk you through the step-by-step process to replace your key fob battery safely and efficiently.

Why Replace Your Key Fob Battery 

The key fob is an essential component for most modern vehicles. It allows you to remotely lock and unlock your car, open the trunk, and even start the engine. When the battery in your key fob starts to weaken, you may notice that it doesn’t work reliably. This can lead to inconvenience, potential lockouts, or even a dead battery at an inconvenient time. Regularly replacing your key fob battery ensures that you won’t get caught in a tricky situation, so it’s a good practice to perform this maintenance task.

Gather Your Supplies

Before you begin, make sure you have the following items

1. New CR2032 or CR2025 battery (refer to your key fob’s manual or inspect the old battery for the correct type).

2. Small flathead screwdriver or a coin.

3. A clean cloth or tissue to handle the battery.

4. Workbench or table with good lighting.

Step-by-Step Guide 

1. Identify the Key Fob’s Battery Compartment: Most key fobs have a small groove or slot on the side. Use a small flathead screwdriver or a coin to gently pry the two halves of the fob apart.

2. Open the Key Fob: Insert the screwdriver or coin into the groove and gently twist to separate the two halves. Be careful not to use excessive force, as you don’t want to damage the key fob.

3. Remove the Old Battery: Inside the key fob, you’ll find the old battery. Carefully use your screwdriver or fingers to pop the battery out. Be cautious and avoid using excessive force to prevent damaging the key fob’s interior.

4. Handle the New Battery with Care: Take the new CR2032 or CR2025 battery and hold it by the edges, making sure not to touch the battery terminals. This prevents any oils or dirt from your fingers from affecting the battery’s performance.

5. Install the New Battery: Insert the new battery with the positive (+) side facing up. The positive side is usually marked on the battery or inside the key fob.

6. Reassemble the Key Fob: Align the two halves of the key fob and gently press them together until you hear a satisfying click, indicating that it’s securely closed.

7. Test the Key Fob: Stand near your vehicle and test the key fob to ensure it works correctly. Lock and unlock your car, open the trunk, and, if your key fob has this feature, start the engine.

Maintenance Tips

To prolong the life of your key fob battery, consider these tips

1. Keep your key fob clean and dry to prevent any corrosion or damage.

2. Carry a spare battery with you, especially during long trips.

3. Replace the battery as soon as you notice a decrease in performance, such as reduced range or delayed response.

4. Dispose of old batteries properly, following local recycling guidelines.


Can I replace the key fob battery myself?

Automakers make it reasonably easy to swap in a new battery, though you may need to use a small screwdriver to pry the key fob open. Generally, these batteries cost $10 or less, though some jobs require two batteries.

How long does the key fob battery last?

For a regular key fob the life expectancy of the battery lasts 4-6 Years. – The life expectancy of a Smart key fob battery is around 2-3 Years.


Replacing your key fob battery is a simple yet essential maintenance task that ensures the continued functionality of your vehicle. With the right tools and a few minutes of your time, you can avoid the inconvenience of a dead key fob battery. Regular checks and replacements, along with proper care of your key fob, will keep your vehicle access convenient and trouble-free. So, the next time your key fob starts acting up, don’t hesitate to follow these steps to keep your key fob in excellent working condition.

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