A dead key fob battery can leave you stranded and frustrated. If you’re constantly hitting the unlock button with no response, your key fob’s battery might be the culprit. Don’t worry, replacing it is usually a quick and easy fix. But first, you need to know what battery your key fob takes. This article will guide you through everything you need to know about key fob batteries, from identifying the right type to replacing it yourself.
Identifying Your Key Fob Battery
Most car key fobs use small, coin-shaped batteries, similar to what you’d find in a watch. The most common types are CR2032 and CR2025.
To find the exact battery type your key fob needs:
- Check Your Owner’s Manual: The easiest way to determine the battery type is to consult your car’s owner’s manual. It will usually list the correct battery specifications.
- Look for Markings on the Battery: If you can open your key fob and access the battery, it should have markings indicating the battery type (e.g., CR2032, CR2025).
- Search Online: A quick online search with your car’s make, model, and year followed by “key fob battery” will usually lead you to the correct information. You can also find compatible batteries on retailer websites like Amazon by entering your car’s information.
Understanding the Difference: CR2032 vs. CR2025
Both CR2032 and CR2025 batteries are 3 volts and have a diameter of 20mm. The key difference lies in their thickness:
- CR2032: 3.2mm thick
- CR2025: 2.5mm thick
While they might seem interchangeable, using the wrong battery type can lead to a poor connection or even damage your key fob.
Where to Buy Key Fob Batteries
Key fob batteries are readily available at various retailers, including:
- Auto Parts Stores: AutoZone, Advance Auto Parts, O’Reilly Auto Parts, and NAPA Auto Parts.
- Electronics Stores: Best Buy, Walmart, Target, and RadioShack.
- Online Retailers: Amazon, eBay, and battery specialty stores.
Tip: Many grocery stores and pharmacies also carry these common battery types.
Replacing Your Key Fob Battery: A Step-by-Step Guide
Replacing your key fob battery is a task you can often handle yourself. Here’s a general guide, but remember that the process may slightly vary depending on your car model:
- Locate the Battery Compartment: Most key fobs have a small release button or latch that you can press or slide to open the battery compartment. Some key fobs might require a small flat-head screwdriver to pry open.
- Remove the Old Battery: Carefully remove the old battery. Pay attention to its orientation, as the new battery will need to be inserted the same way.
- Install the New Battery: Place the new battery into the compartment, ensuring the positive (+) side faces up (or as indicated in the compartment).
- Close the Key Fob: Snap the battery compartment shut or secure it using the screwdriver.
- Test Your Key Fob: Ensure your key fob is functioning correctly by locking and unlocking your car.
Still Having Issues?
If replacing the battery doesn’t solve the problem, there might be other issues with your key fob, such as:
- Programming Errors: Your key fob might need to be reprogrammed to your car.
- Antenna Problems: A faulty antenna in your car or key fob can disrupt the signal.
- Internal Key Fob Damage: Physical damage or water exposure can damage the key fob’s internal components.
If you suspect a more serious problem, it’s best to consult a qualified automotive locksmith or your dealership for diagnosis and repair.
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Key Fob Battery FAQs:
1. How long do key fob batteries last?
Key fob batteries typically last between 3 to 5 years, depending on usage and environmental factors.
2. Can I replace the key fob battery myself?
Yes, replacing the battery is usually a simple DIY task that you can do at home.
3. How do I know if my key fob battery is low?
Signs of a low key fob battery include decreased range, inconsistent locking/unlocking, and the need to press buttons multiple times.
4. Can a dead key fob battery drain my car battery?
No, a dead key fob battery will not drain your car battery. They are separate systems.
5. What happens if I use the wrong battery in my key fob?
Using the wrong battery size can prevent the key fob from working correctly and could potentially damage the device.
Conclusion
Knowing what battery your key fob takes is the first step towards a quick and easy fix for a common car problem. With a bit of knowledge and a new battery, you can get back to unlocking your car with ease. However, if replacing the battery doesn’t solve the issue, don’t hesitate to seek professional help for proper diagnosis and repair.
