In your car’s key fob lies an electronic transmitter chip responsible for transmitting signals when you press the button to unlock your doors. This chip relies on a small battery for power.

In essence, the lifespan of a key fob battery typically ranges from 3 to 4 years, contingent upon your usage. The more frequently you employ your key fob, the faster its battery is likely to deplete. Conversely, if your key fob sees less frequent use, it might endure for up to 5 years, as it primarily activates when unlocking your doors. For those who rely on their key fob daily, you may find yourself needing to replace it after just three years.

If you’re curious about how long a key fob battery lasts after receiving a warning, this article will not only address that question but also elucidate what occurs if your car’s key fob battery does indeed fail.

Let’s delve deeper into the world of key fob batteries.

Signs Your Key Fob Battery Needs Replacement: Stay Prepared

Here are some indicators that it’s time to replace your key fob battery so you won’t be caught off guard:

  1. Reduced Range: When your key fob stops working within the usual range, it’s a sign of a low battery. As the battery weakens, the transmitter struggles to emit signals effectively.
  2. Delayed Response: If your vehicle’s doors take longer to lock or unlock than before, it’s a sign that the key fob battery is losing its performance and needs replacing.
  3. Functional Irregularities: You might find yourself needing to press the key fob button multiple times for it to work correctly. In such cases, consider scheduling a battery replacement.
  4. Dashboard Warning Light: A warning light on the dashboard will illuminate when the key fob battery is running low.
  5. Inactive LED Light: The key fob typically has a flashing LED light when you press a button. If it doesn’t light up, it could indicate a dead battery or a malfunctioning key fob.

Can You Replace the Key Fob Battery Yourself?

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Replacing the battery in a key fob is a straightforward process. Start by carefully opening the fob’s shell using a flat screwdriver or your fingertip. Replace the battery if needed, being cautious not to damage it. Close the key fob by firmly pressing it all around to ensure it’s securely sealed.

Key Fob’s Additional Functions

Did you know that your key fob can do more than just unlock doors and start your car? Here are some additional functions it can perform:

  • Open Windows: Press and hold the unlock button twice to roll down your car’s windows remotely.
  • Fold Mirrors: If you need to fold your side mirrors to navigate tight spaces, press and hold the lock button for ten seconds.
  • Locate Your Vehicle: If you’ve ever struggled to find your parked car, use your key fob’s panic button to activate the car’s alarm system.

Symptoms of a Dead Key Fob Battery

When your key fob battery is dying or dead, you may notice these symptoms:

  • Reduced Signal Strength: The key fob’s range decreases, and you need to be closer to the vehicle for it to work.
  • Multi-Click Locking: It takes multiple clicks to lock or unlock the doors.
  • Intermittent Functionality: The key fob may not consistently work as expected.

Ensure you use the correct type of battery, as a replacement battery may have a different voltage even if the fob still works. If you have multiple key fobs, consider replacing all their batteries simultaneously, as they often run out around the same time.

Troubleshooting Your Car Key After Battery Replacement: Common Issues

If your car key isn’t functioning after you’ve replaced the battery, and you’re using a key fob with a START button to start the engine, several factors could be causing this problem. Avoid touching the key fob circuit with your bare hands to prevent interference.

Car key remote fobs, while convenient, can encounter issues over time. Even if it’s just a dead battery, your remote may eventually fail to unlock your car doors.

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While there are various reasons why a keyless entry remote might stop working, many of them are easy to diagnose. The most common problem with these car key fobs is that their batteries degrade over time, a simple issue that can be resolved by replacing the battery.

Other key fob problems are a bit more complex but still fixable. If your remote no longer locks or unlocks your car doors, try these five steps first:

  1. Confirm if the primary remote is faulty by using a backup remote.
  2. Check and replace the key fob battery if necessary.
  3. Inspect for broken contacts or misaligned buttons by disassembling the key fob.
  4. Attempt to reprogram your remote yourself or seek professional assistance.
  5. If needed, consider replacing your remote control.

Can You Replace a Key Battery for a Pound?

When purchasing a key battery, ensure it is of good quality. Cheap key batteries, often costing only a pound, can lead to various issues and are not durable enough for extended use. To reassemble your key fob, clip it back together, insert the blade, and you’re good to go.

It’s important to note that replacing a key fob is more costly than replacing the battery, so it’s worth exploring a battery replacement first.

If your remote key fob no longer remotely opens doors or does so intermittently, it may be due to a depleted battery, and replacing it is advisable.

Even if your fob’s battery is dead, you can still enter and start the car; only the remote locking and unlocking functions will be affected.

Lastly, the immobilizer system, which communicates with the key’s passive transponder chip, remains unaffected by the battery’s status as it does not rely on battery power.

Final Thoughts

In summary, the typical lifespan of most vehicle key fob batteries is three to four years with average use. Additionally, where you store your fob can impact its battery life, so avoid leaving it in the car or near the vehicle overnight.