Is your car key fob starting to feel a little unresponsive? Do you have to press the unlock button multiple times to get your car to react? It might be a sign that your key fob battery is dying and needs replacing. Like any battery, the one in your key fob wears out over time, but the good news is, you can often replace it yourself, saving time and money compared to going to a dealership or repair shop.
While it might seem daunting at first, replacing a key fob battery is actually a straightforward process that most car owners can handle. You don’t need to be a car expert to do it! With just a few simple tools and a little patience, you can easily breathe new life into your car key remote. This guide will walk you through each step of how to replace battery in key fob, ensuring you can get back to unlocking your car with ease.
Gather Your Tools for Key Fob Battery Replacement
Before you begin, gather the necessary tools. Having everything ready will make the process smoother and faster. Here’s what you’ll typically need:
- A small, flathead screwdriver or a watch knife: This is used to gently pry open the key fob case. A thin blade works best to avoid damage.
- A new battery: Most key fobs use a CR2032 coin cell battery, but it’s crucial to check your specific key fob to confirm the correct type. You can usually find this information in your car’s manual or by looking at the old battery once you open the fob.
- A precision screwdriver set (possibly): Some key fobs use tiny screws to secure the case. If you see screws, you’ll need a screwdriver that fits. Sizes between 1.4mm and 2.4mm are common.
- Tweezers (optional but helpful): Tweezers can be useful for removing and inserting the small battery, especially in tight spaces.
- Your smartphone camera: Taking photos as you disassemble the key fob can be a lifesaver when it’s time to put it back together.
Step-by-Step Guide: How to Replace Battery in Key Fob
Now that you have your tools, let’s get started with the key fob battery replacement.
Step 1: Open the Key Fob Case
The first step is to carefully open your key fob. Examine the fob closely to see how it opens. Many fobs have a small notch or seam where you can insert your flathead screwdriver or watch knife.
Gently insert the tip of your tool into the notch or seam and twist or pry carefully. Avoid using excessive force, as you could damage the plastic case. Work your tool around the seam, gently loosening the fasteners. Some key fobs might require sliding a physical key out first to reveal screws or a better opening point. Refer to your car’s manual if you are unsure.
Step 2: Identify the Battery Type
Once the key fob case is open, take a look inside. Before removing the old battery, check what type it is. You’ll usually find the battery type printed directly on the battery itself. Common types are CR2032, CR2025, or CR1632. Note this down so you can purchase the correct replacement.
If you’re unsure, or if the writing is worn off, taking a picture with your phone at this stage is a good idea. You can also compare the size and shape of the old battery to new ones at the store if needed.
Step 3: Remove the Old Battery
Carefully remove the old battery. In some key fobs, the battery might be held in place by small clips or a retaining piece. Use your tweezers or fingertip to gently lift the battery out. Pay attention to the battery’s orientation – notice which side is facing up (usually the positive side, marked with a “+” symbol). You’ll need to insert the new battery in the same way.
Step 4: Insert the New Battery
Take your new battery and insert it into the battery compartment. Make sure the orientation is correct, matching how the old battery was placed (positive side up or down). You should feel the battery snap or slide into place.
Step 5: Close the Key Fob Case
Carefully align the two halves of the key fob case and snap them back together. Press firmly until the case is securely closed, ensuring there are no gaps. If your key fob had screws, make sure to replace and tighten them carefully, but don’t overtighten.
Step 6: Test Your Key Fob
Finally, test your key fob to make sure it’s working correctly. Try unlocking and locking your car, and test any other functions like remote start or panic button. If everything works as expected, you’ve successfully replaced your key fob battery! If it’s still not working, double-check that you installed the correct battery type and that it’s inserted with the correct polarity.
Important Tips for Key Fob Battery Replacement
- Work on a clean, flat surface: This will prevent small parts from getting lost if they happen to fall out.
- Be gentle: Avoid forcing anything open or pulling on internal components. Key fobs contain delicate electronics.
- Take photos: As mentioned before, taking photos during disassembly is extremely helpful when reassembling the fob.
- Don’t touch the circuit board: Avoid touching the circuit board or any of the internal wiring unless necessary. Focus only on the battery compartment.
- If in doubt, seek professional help: If you’re uncomfortable with any part of this process, or if your key fob seems particularly complex, it’s always best to consult a professional. Many auto parts stores or locksmiths can replace key fob batteries for a small fee.
Replacing your key fob battery is a simple DIY task that can save you time and money. By following these steps and taking your time, you can easily restore your key fob to its full functionality and avoid the frustration of a dead car remote. And remember, for all your car battery and key fob battery needs, you can always rely on trusted battery providers like Interstate Batteries.
