Honda Key Fob Battery

Honda Key Fob Battery Life and Replacement

2010 Honda Civic Key Fob Battery Size
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Remote entry systems are a valued part of any vehicle, especially your Honda. They allow you to lock and unlock your car with ease and can even set off a panic alarm in case of an emergency, and in this article, we will explain Honda key fob battery life and replacement.

If the battery in your keyless entry remote is running low, you’ll notice a decrease in range and eventually a lack of response. Replacing your Honda key battery is easy and takes less than five minutes.

When does the Key Fob Battery Need Replacing?

Modern cars are full of electronics, and a key fob is no exception. Inside, it has an electronic chip that works as a transmitter; it transmits the signal when you press the button to open the door. The key fob is powered by a little battery. The battery may last for 2-3 years in a smart key fob and for 4-6 years in a regular fob with the key. 

Battery and door key inside the key fob. The reason for this difference is that the smart key fob also has a receiver and has to communicate with the car more often when it’s inside or near the car. In most cars, a key fob battery is not rechargeable, and must be replaced once it loses its charge.

What are the Signs of a Weak Fob Battery? 

As the fob battery becomes weaker, the transmitter loses its range. This means that you have to be closer to the car for the fob to work. In cars with a push button start, a vehicle may not always recognize a smart key fob in your pocket or purse if the fob battery is weak. In some cars, a warning message “key fob battery low” may also pop up on the driver’s display.

Will the Car Start If the Fob Battery is Weak? 

In most cars, the security (immobilizer) chip inside the fob works without a battery, but only from a very close range. So even if the fob has a weak battery, it should still start the car. You may have to hold the smart fob closer to the “Start” button or insert it into a special slot to start the engine. Check your owner’s manual for directions. A conventional mechanical key might also be stored inside the fob. This key can open the driver’s door in case the fob battery is dead or if the main battery in a car is discharged.

Honda Key Fob Battery Life and Replacement

In many cars, a key fob has a little LED light that illuminates when pressing any of the fob buttons. If the LED light doesn’t light up at all, the fob battery is dead or there is some other problem with the fob. If you already have the fob battery out, you can check its voltage with a voltmeter. The voltage is marked on the battery.

If it’s a 3-Volt battery, and it shows less than 3 Volts, it’s weak. For example, this 3-Volt battery in the photo shows only 2.8 Volts; it’s bad and must be replaced.

What kind of a battery does a key fob take? Different cars use different batteries. The most common types are CR2025 and CR2032 3-Volt batteries. You can find the exact type in the owner’s manual. Batteries like this are sold in any electronics store or at a dealership.

Changing the fob battery is not very difficult. Check the owner’s manual for the instruction and precautions. There are plenty of YouTube videos on how to do it too. You might need a small flat or Phillips screwdriver. 

For example, to open the key fob in the top photo, we pried it open with a little flat screwdriver in places indicated in the owner’s manual. Be careful; the plastic tabs that hold the parts of the fob together break easily. In some cars, there could be some tiny screws or other parts that are easy to lose.

Here’s how to replace your Honda remote entry fob battery in five easy steps.

1. Determine Your Battery Type:

Flip over your keyless entry remote and look for the battery type written on the back. If the battery type is illegible, don’t worry. Once you open the fob, the battery type will be written on the existing battery.

2. Open your Honda Key Fob:

If your keyless entry remote has a screw, remove it using a jeweler’s screwdriver. Separate the two halves of your remote using a small flathead screwdriver. Exert gentle pressure to avoid damaging the key.

3. Remove the Dead Battery:

Note the position of the positive and negative sides of the battery in the remote when you remove it. This will ensure you install your new battery properly. Be careful not to touch the battery terminals with your fingers. The oils in your skin can corrode the terminals and result in a shorten the life of your remote.

4. Insert the New Battery:

The new battery should go in the same position as the old. If you’re unsure, look for the positive (+) and negative (-) marks inside your keyless entry fob.

5. Reconnect the Two Halves of Your Honda Keyless Entry Remote:

Align the two halves of the fob and apply gentle pressure until you hear the remote snap together.

Test your remote to ensure it’s working properly. If you’ve purchased multiple batteries, leave the remaining batteries in the packaging and tape them inside your glovebox. Do not apply tape directly to the battery, the adhesive will effect its conductivity.

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