Are you experiencing issues with your car key fob? Does it take multiple presses to lock or unlock your doors, or perhaps it’s stopped working altogether? Before you rush to the dealership for an expensive replacement, the solution might be as simple as a Changed Key Fob Battery.
Like any battery, the one in your car key fob has a limited lifespan. Over time, it will naturally wear out, leading to a weakened signal and eventually a non-functional remote. You might start noticing that you need to be closer to your car for the fob to work, or that the buttons are less responsive. These are classic signs it’s time for a key fob battery replacement.
While you could seek professional help from a dealership or auto repair shop, replacing a key fob battery is actually a straightforward task you can easily do yourself at home. It’s a cost-effective and empowering DIY project that requires minimal tools and time. In most cases, all you need is a new battery and a few household items to get your key fob working like new again.
Signs Your Key Fob Battery Needs Changing
How do you know for sure if it’s a low battery causing your key fob problems? Here are the common indicators that signal it’s time for a changed key fob battery:
- Reduced Range: You need to be significantly closer to your car than usual for the key fob to function.
- Intermittent Operation: The key fob works sometimes but not others, especially when the weather is cold.
- Weak Signal Light: The small LED light on your key fob is dim or doesn’t light up when you press a button.
- Unresponsive Buttons: You have to press the buttons multiple times, or very firmly, for the car to respond.
- Dashboard Warning Light: Some newer cars display a warning message on the dashboard indicating a low key fob battery.
If you’re experiencing any of these symptoms, don’t immediately assume you need a new key fob. The vast majority of the time, a simple and inexpensive changed key fob battery will resolve the issue.
Tools You’ll Need to Change Your Key Fob Battery
Before you begin, gather these simple tools. You likely already have most of them at home:
- New Battery: Identify the correct battery type for your key fob. Common types are CR2032, CR2025, and CR1632 coin cell batteries. Check your owner’s manual or the old battery for the correct number.
- Small Flathead Screwdriver or Pry Tool: A watch knife or eyeglass screwdriver works perfectly for gently prying open the key fob casing.
- Precision Screwdriver Set (Optional): Some key fobs use tiny screws to secure the case. A precision screwdriver set will be helpful if screws are present.
- Tweezers (Optional): Tweezers can assist in removing and inserting the small battery, especially in tight spaces.
- Phone Camera: Taking photos during disassembly is highly recommended to remember the placement of parts, particularly the battery orientation.
Step-by-Step Guide to Changing Your Key Fob Battery
Now, let’s get to the process of replacing your key fob battery. Follow these steps carefully:
Step 1: Open the Key Fob Casing
- Inspect for Screws: Examine your key fob for any tiny screws holding the case together. If screws are present, use the appropriate precision screwdriver to remove them and set them aside in a safe place.
- Locate the Notch or Seam: Most key fobs have a small notch or seam along the edge of the casing designed for opening.
- Gently Pry Open: Insert your flathead screwdriver or pry tool into the notch or seam. Apply gentle pressure and twist to begin separating the two halves of the casing. Work your tool around the seam, carefully prying it open section by section. Avoid forcing it open at just one point, as this can damage the plastic.
Step 2: Remove the Old Battery
- Identify Battery Orientation: Before removing the old battery, take a close look at its orientation. Note which side is facing up (usually the positive side with a “+” symbol). Taking a photo with your phone at this stage is very helpful.
- Use Tweezers or Fingertip: Gently use tweezers or your fingertip to lift the old battery out of its compartment. Some batteries might be held in place by small clips or a sliding metal piece. If so, carefully move these aside to release the battery.
Step 3: Insert the New Battery
- Match Battery Type: Ensure the new battery is the correct type as the old one.
- Insert with Correct Polarity: Place the new battery into the compartment, matching the correct polarity (+ and -) as you noted or photographed earlier. The positive side usually faces up.
- Ensure Secure Fit: Make sure the battery is securely seated in its compartment.
Step 4: Close the Key Fob Casing
- Align the Casing Halves: Carefully align the two halves of the key fob casing.
- Snap or Screw Back Together: Press the two halves firmly together until they snap securely closed. If there were screws, reinsert and tighten them gently, being careful not to overtighten.
- Test Your Key Fob: Test the buttons on your key fob to ensure it is working correctly.
Choosing the Right Replacement Battery
Selecting the correct replacement battery is crucial for your key fob to function properly. Here’s how to ensure you get the right one:
- Check the Old Battery: The battery type is usually printed on the old battery itself. Look for markings like CR2032, CR2025, CR1632, etc.
- Consult Your Owner’s Manual: Your car’s owner’s manual should specify the correct battery type for your key fob.
- Online Resources: Many websites and online retailers have battery finders where you can input your car’s make, model, and year to find the correct key fob battery.
- When in Doubt, Open First: If you’re unsure, it’s always best to open your key fob and check the battery type before purchasing a replacement.
Most key fobs use common lithium coin cell batteries, readily available at drugstores, supermarkets, and online retailers. Having the correct battery ensures optimal performance and longevity for your key fob.
Troubleshooting and Tips
- Key Fob Still Not Working? If your key fob doesn’t work after a changed key fob battery, double-check the battery polarity, ensure the battery is correctly seated, and that the casing is fully closed. If it still doesn’t work, there may be another issue, and it’s best to consult a professional.
- Static Electricity: In dry conditions, static electricity can sometimes interfere with electronics. If you are having trouble, try touching a metal object to discharge any static buildup before handling the key fob components.
- Handle with Care: Key fobs contain delicate electronic components. Handle them with care during the battery replacement process to avoid damage.
- Don’t Touch Circuit Board Components: Avoid touching the circuit board or any other internal components of the key fob, as static discharge or mishandling can cause damage.
Changing your key fob battery is a simple and satisfying DIY task that can save you time and money. By following these steps, you can easily restore your key fob to its full functionality and regain the convenience of remote locking and unlocking. Remember to always double-check the battery type and handle your key fob with care. If you need further assistance or are looking for key fob replacement options, visit your local Interstate All Battery Center for expert advice and products.
