How Long Does A Key Fob Battery Last After Warning?

It contains an electronic transmitter chip that transmits the signal when you press the button to open the door. A small battery is used to power the key fob.

In short, depending on usage, a key fob battery will last 3-4 years. The key fob’s battery will run out faster the more it is used. When used infrequently, a key fob battery can last up to 5 years (only activated when unlocking doors). You may need to change your key fob after three years if you use it frequently (e.g., every day).

If you’re wondering how long a key battery lasts after a warning, this article will undoubtedly provide an answer. It moreover explains how to figure out if the car would start if the key fob battery fails.

So, let’s get started to know more about the key fob battery.

Signs That Your Key Fob Battery Needs to Be Replaced

Here are some symptoms that your key fob battery needs to be replaced so you don’t get caught off guard:

1. The range of the key fob has been reduced

When you find the key isn’t working when you’re within normal range, it’s a sign that the battery is running low. The transmitter is unable to emit the proper signals as the battery becomes weaker.

2. Response time is delayed

It’s time to replace the batteries in your fob key if the doors are taking longer to lock or open since it’s fragile and not performing as well as they once did.

3. Functionality that isn’t quite right

About the key fob, you may notice that you have to push the button numerous times before it works. If that’s the case, you’ve discovered it early and can go ahead and schedule a battery replacement.

4. On the dashboard, there’s a warning symbol

A warning light will illuminate on the dashboard when the battery is low.

5. LED light on the key fob

There is a light that flashes when you push the key. If it doesn’t, either the battery is dead or the key is malfunctioning.

Is it Possible to Replace the Battery on Key Fob Yourself?

It’s simple to replace the battery in a key fob. Begin by cracking open the shell with a flat screwdriver or even your fingertip. Replace the battery if necessary. It’s important to remember not to break it. Close the key by pressing it all the way around to make sure it’s completely shut, and you’re finished.

Key Fob Functions

Did you realize your key fob can do more than just open doors and start your car? The following is a list of the jobs that it can complete:

Your windows are rolled down to do so, press and hold the unlock button twice, and the windows will open.

Fold the mirrors with them. When you need to fold your mirrors because you are crammed into a small place. You can fold your side mirrors to avoid them colliding with a pillar, a wall, or another vehicle. To do so, press and hold the lock button for ten seconds.

It can assist you in locating your vehicle. Have you ever forgotten where you parked your car? If you haven’t heard of it, it may seem far-fetched, yet it is fairly common. Use your key fob if this happens to you. It has a panic button that activates the car’s alarm system.

What are the Symptoms of a Key Fob Battery When It is Dead?

Symptoms of a Failing or Dead Key Fob Battery:

  • Signal strength has dropped. In many cases, today’s fob keys can send a signal to the vehicle up to 50 feet away. Many people own cars, trucks, and SUVs.
  • Unlocking the doors required multiple clicks.
  • The key fob does not always work.

Make sure you’re using the right kind of battery. Even if the fob still works, a replacement battery will have a different voltage, and the system may not register properly. If you have numerous key fobs, replacing all of the batteries at the same time is a smart idea because they tend to run out at the same time.

Why might your car key be not working now that has been replaced with the battery?

If your key does not function after you replace the car battery, start the engine with the key fob by pushing the START button. Here are several probable causes for your key not working after replacing the key fob battery. Do not interfere with the key fob circuit. Touching the key fob circuit with your bare hands is not a good idea.

Although car key remote fobs are convenient, they always fail at some point. Even if it’s only a dead battery, the remote will almost certainly fail to unlock your car doors at some point.

While there are a few reasons why a keyless entry remote may cease working, most of them are rather simple to verify. The most typical issue with these car key fobs is that the batteries die over time, in which case a new battery should resolve the issue.

Other key fob remote issues are more difficult to resolve, but they are still fixable. When your remote stops locking or unlocking your car doors, try these five things first:

  • By using a backup remote, you can confirm that the primary remote is broken.
  • Check the key fob battery and replace it if necessary.
  • Check for broken contacts or misaligned buttons by disassembling the key fob.
  • You can reprogram your remote yourself or hire someone to do it for you.
  • If necessary, replace your remote control.

Is It Possible To Replace A Key Battery For A Pound?

Make sure you get a good key battery when you buy one. We encounter a lot of issues that are caused by cheap key batteries that cost five pounds. They aren’t strong enough to labor for an extended period. To reassemble, simply clip it back down, insert the blade, and you’re ready to go.

Because replacing a key fob is more expensive than replacing the battery, it’s worth seeing if the issue can be handled with a new battery.

It’s conceivable that the battery in your remote key fob needs to be replaced if it’s no longer remotely opening doors. Similarly, if the doors only open occasionally, the battery may be poor, and a replacement is recommended.

It’s worth noting that even if your fob’s battery is dead, you can still get in and start the car; it’s just the remote locking and unlocking that won’t work.

There will be no effect on the immobilizer because the battery solely powers the remote opening mechanism. The immobilizer communicates with the key’s passive transponder chip, which does not require a battery.

Final Words

To summarize, the battery life of most vehicle key fobs is three to four years with average use. It’s also worth noting that the location where you keep your fob can affect its battery life. Leaving the fob in the car or on a hook near the car overnight is not a good idea.

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