How To Replace Key Fob Battery

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What Is A Key Fob

How To Replace a Battery in a Car Key Fob

A key fob sometimes called a remote keyless system is a handheld device that allows you to lock and unlock your vehicle remotely. It consists of a remote control and RFID antenna that is connected to your cars locking system. Some key fobs have a retractable physical key with which you can lock/unlock your car manually as well.

Does My Fob Need To Be Reprogrammed After Replacing The Battery

In general, you do not have to reprogram the key fob. It should still be synched. If you replace the battery and the fob still wont unlock the doors or start the car, it may need to be reprogrammed. You need to either schedule an appointment at a dealer and use your spare fob to drive there, or call an automotive locksmith who can come to you.

Which Battery Does The Ford Key Fob Use

The new models of Ford key fobs use one CR2032 battery. This battery is lithium-based and has a longer life span.

The older models of Ford key fob used two CR2025 batteries. They are also lithium batteries.

Both batteries are 20mm in diameter. CR2032 has a thickness of 3.2mm while CR2025 has a thickness of 2.5mm.

Both battery types are rated at 3volts, have a life span of between 3 and 5years when in use, and shelf life of up to 10 years when stored under room temperatures.

Both batteries can operate in varying environments with both giving satisfactory performance at -200C as well as at +600C

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How To Change A Battery In A Key Fob Easily

Do you want to change the battery in your key fob, but you don’t know how to go about it? Key fobs usually contain replaceable watch batteries that look like a small coin. If you are having a hard time replacing your old battery in your car key fob, here is a quick guide on how to change a battery in a key fob.

Some key fobs make it seem easy when accessing the old battery, while some require much work.

A quick question before any battery replacement is whether the type of battery you are dealing with is a rechargeable battery or not.

This is because some non-rechargeable batteries found in most key fobs are easier to pop out and replace.

On the other hand, if you deal with a rechargeable battery type, you will need more tools to replace the old battery. For example, you may need a soldering iron to remove the battery from the circuit board and a strong glue to secure the key fob back together. Let us now discuss the procedure on how to replace a battery in a car key fob to help you get the job done quickly.

Why Wont My Key Fob Work After I Changed The Battery

Changing a Ford Focus (2002) Key Fob Battery

To open the key fob and inspect for damaged contacts or misaligned buttons, you may use basic tools. Replace the automobile key fob if that doesnt work. Another reason your vehicle remote may not function after replacing the battery is the lock. Check for these symptoms to see whether the lock or vehicle door has become faulty.

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Gently Pry At The Seam Or Notch

Alaina DiGiacomo/

When it comes to how to change the battery in your key fob, youll only need one tool. Using a small, thin flat-bladed screwdriver , pry apart the two halves gently to open the fob down the middle. Most cars with key fobs and transponder keys wont let you lock your keys inside the car, but you need to be prepared just in case the worst case happens. .

S To Replacing Your Ford Vehicles Key Fobs Batteries

How do you know when to replace your key FOBs batteries? Look for a message on your vehicles instrument cluster or display screen telling you that the battery is low. At that point, it is time to follow this quick guide to replacing the batteries.

  • Release the key blade. For some models, you will need to manually pull the blade out. Others will have a release button.
  • Use a flat screwdriver to pry open the key FOB. You do this by inserting the end of the screwdriver into the side of the key, where the key blade normally rests. Carefully remove the cover, which exposes the battery. In models where you pull the blade out, youll need to use a small coin instead and wedge it into the gap where the key was located. Twisting it will pop the cover off.
  • Use the screwdriver to pry out the battery. The battery can be tricky to get out as it is flat and smooth. Using the screwdriver as a pry bar should work on either key FOB model.
  • Insert a new battery. Put it in the same position that the previous battery was in, with the plus side up. Having the battery upside down will make the key FOB not work.
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    The Top Signs You Need Key Fob Battery Replacement

    Car key fobs are so convenient that its easy to take them for granted. But did you know that your key fob needs routine maintenance? Key fob batteries should be replaced every three or four years, although this will vary based on their amount of use and build quality.

    If your key fob were to suddenly stop working when youre far from home, youd wish you had cared for it. Dont get stranded with a malfunctioning key fob and have to pay for a tow. Here are some warning signs that you may need a key fob battery replacement before its too late.

    Replace The Battery In The Key Fob For Ford Models Earlier Than 2015

    How To Replace Install Battery Car Key Fob Remote Easy Simple

    Step 1: Press the silver or chrome button to open the metallic key that is tucked inside the key fob

    Step 2: On the slot where the key has come from, you will see two holes. The second hole away from the key, insert a flat screwdriver and push forward, away from the direction of the key.

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    Step 3: The key fob will open into two halves. On the part without the key, you will see a slot.

    Step 4: Insert the key or the flat screwdriver in the slot and twist it. It will open the part of the key fob into two revealing the battery.

    Step 5: Notice the direction the battery is facing. Pop it out and replace it with the new battery.

    Step 6: Put the two halves together and press them. You will hear a click sound as they lock-in. Slit that half into the other half that has the key. Push down and you will hear a click sound as it locks in.

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    Identify And Procure The Correct Battery Type

    In most key fobs, the battery is called a button or coin cell battery because of its shape and size. The identification number is etched into the flat side of the battery. This ID number is three to four digits long, and the new battery must have the same number. The battery most commonly used in key fobs is the CR2032 battery, but other widely used button batteries include the CR2450, CR2025, CR1616 and CR2016.

    Key Fob Battery Replacement

    Do all the signs point to your key fob needing a battery replacement? Sometimes other mechanisms inside your key fob break and require repair. But you should always opt to have the batteries inside your fob replaced first since thats most likely the culprit. If this fixes the problem, youll also save a significant amount of money.

    From your car dealership, a key fob replacement tends to run at least $200 or more. Self-repair is an option, but some key fobs make it difficult to access the cell batteries that power the device. And in the hands of a professional, they can also easily check the voltage to ensure your batteries are at fault.

    A key fob battery replacement is the cheapest repair option. The replacement tends to run somewhere around $10.

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    S To Change Battery In Ford Key Fob For Models After 2015

    Step 1: On the grooved side of the key fob, press on the groves that appear on both sides. When you press, the top cover of the key fob will pop up just a little bit.

    Step 2: Use a flat head screwdriver to open the cover completely. It will reveal the metallic key inside.

    Step 3: Remove the metallic key. On one edge you will see a small opening

    Step 4: Slide the flathead screwdriver in the slot and twist it. The key fob will pop open into two halves. Use your hand to gently open the key fob completely to reveal the battery.

    Step5: Use the flat screwdriver to pop up the battery. Note the direction the old battery is facing

    Step 6: Replace the new battery making sure the polarity is correct. You will be sure of this if the new battery faces the same direction as the old battery.

    Step 7: Replace the key fob top and when they are set in place, press together. You will hear a click to signify locking. Replace the key inside and then replace the top cover that covers the key.

    How To Replace The Battery In A Key Fob


    This article was co-authored by Shawn Fago. Shawn Fago is a Master Locksmith and the Founder of Noble Locksmith, a nationwide locksmith company based in San Diego, California. With over seven years of experience, he specializes in providing commercial, residential, and automotive locksmith services. Shawn attended California State University, Fullerton. This article has been viewed 184,504 times.

    No matter what type of key fob you have, you can replace the battery in a few minutes. The technique to open the fob and the battery you need differs slightly depending on the specific key fob you own. Pry open the fob, then swap the old battery out for a new one. Your key fob should then work as intended once again.

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    Q3 How Do You Change The Car Key Battery Yourself

    Ans. First check the battery type in the plastic housing. Then pry open the 2 halves of the key fob. Check the battery terminals positive and negative ends. Remove the old battery and discard it. Place the new battery in the correct position at the correct terminals. Assemble the key fob in the same way you had disassembled it.

    How To Replace A Key Fob Battery

    Key fobs allow easy access to your car. Once the key fob battery is weak or dead youll lose your fobs ability to control remote functions. 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. The battery is only there for the fob to control remote functions. Replacing the battery is easy and they can be found at any auto part store, supermarket, or pharmacy.

    Replacing the battery

    Small flat-head screwdriver

    Step 1:

    Open your key fob. Generally, all you need to open up your key fob is a strong fingernail. If that doesnt 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.

    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.

    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.

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    Can You Drive With A Dead Key Fob

    No auto manufacturer is going to pin everything on the key fob working all the time. Therefore, even if your battery dies, you can still use the fob to drive the car.

    • Despite most cars going keyless, several of them still have a key slot usually located on the steering column. It will typically be covered by a plastic cover which you can pop off. Once you insert the physical key into it, you can easily turn on the car and drive away.
    • Some cars begin ignition with the START button, which switches on the car only if the key is detected. With a dead battery, the car may not recognize the key fob and hence the START button may be unresponsive. In such cases, you can use the fob itself to push the START button, which will switch on the car.
    • Some vehicles like Fords have a slot on the steering column where you can insert the fob, which will start the vehicle.

    Do I Need To Reprogram The Key Fob After Changing The Battery

    How To Replace A Toyota Key Fob Battery-Corolla, Camry, Etc.

    Typically, you do not need to reprogram the key fob after changing the battery. However, if youve replaced not just the batteries but also some of the internal wiring and electronics, you may need to reprogram it by pairing it with your vehicle once again.

    The usual sequence for reprogramming your car battery is as follows:

    • Put the key into the ignition
    • Turn the key into the ON position and then turn it back to the LOCK position.
    • Do this several times until you hear a chiming sound
    • Press the lock and unlock position on your key fob to reprogram it. This should ensure the correct functions are saved and that the vehicle will respond the next time you use it.

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    How To Start Ford Car With A Dead Key Fob

    There are two methods to start the Ford car engine even with a dead key fob.

    Method 1: On the right-hand side of the steering wheel, there is a place with a key picture. Place the key fob there and while depressing the brakes, press the start button and start the engine.

    Method 2: Depressing the brake pedal, press the start button using the key fob. The engine will start normally.

    These Are The Basic Principles Of A Key Fob Regarding Their Design Manufacture And Use:

  • A key fob is a remote control with a radio frequency ID chip and an antenna. The key fob uses radio frequencies to send signals to another radio frequency ID reader device inside the car that controls the locking mechanism. Each key fob transmits a specific RFID information tag that can be read by the reader device inside the car.
  • When the button on the key fob is pressed, the key fob will transmit a radio frequency ID message to the receiving device inside the car. If the radio frequency that is transmitted from the key fob corresponds to the receiver mechanism that is programmed to accept it, the unlocking mechanism will open the door lock.
  • Radio frequency ID key fobs are very versatile and can be programmed for various purposes. The functions such as unlocking a specific door or firing up the engine can be programmed into the keyless system. In most of the cases, the key fob unit has multiple functions assigned to it using different buttons.
  • Usually, the key fob will be contained in a plastic enclosure that is small enough to fit in your hand. Some key fobs dont have any buttons, instead they have proximity sensors that work when passed in front of the receiver electronic lock/unlock mechanism. Other types of key fob systems use buttons to transmit a radio frequency that is specific to the lock/unlock mechanism. Each button on the key fob performs a certain function like unlocking the vehicle, locking it or starting the engine and even opening the trunk lid.
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    What Size Battery Do I Need For My Key Fob

    Most car keys take CR2032 and CR2025 3-Volt batteries, but that doesnt mean they fit every key fob. Different cars take different batteries. You can find the exact type in the owner’s manual.

    If the owner’s manual is not handy, you can always check your current key fob. Then replace it with the exact type.

    Can You Replace A Key Fob Battery Yourself

    How to Replace a Key Fob Battery

    You can replace the battery in your key fob by following these steps:

  • Find out the type of battery used: This will be embossed on the side of the fob. The most commonly used type of batteries are button cells, sold by brands like Duracell and Energizer.
  • Open the key fob at the seam: Most key fobs are made of two halves that join together at a seam. You can easily split them apart by using a finger or sharp edge against the notch.
  • Take out the old battery and replace it with a new one: The button cell battery will look like a little silver coin. Pop out the old one and pop in the new one the same way. Take care to insert it in the same orientation .
  • Snap the fob halves back in place and test it: Check whether the lock/unlock and start functions are working properly to ensure youve replaced the battery correctly.
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    Can You Unlock Your Car With A Dead Key Fob

    Yes! Having a dead battery in your car key fob does not mean that you are left stranded. Car manufacturers have foreseen this situation and built in fail-safes to ensure you can unlock your car even in such a situation.

    Heres what you should do:

    • All car manufacturers include a mechanical key in the cars key fob. This can be accessed by sliding/pressing a small button usually located on the side of the key fob, which will remove the fob cover.
    • Once you get the mechanical key out of the fob, insert it into the key slot and turn it to unlock/lock your car.

    Mechanical keys are usually included in the key fobs of all major car manufacturers like Honda, Kia, Toyota, Mercedes, Ford, etc.

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