It’s a common scenario: you’re standing by your car, repeatedly pressing the unlock button on your key fob, only to be met with silence. Often, the culprit is a dead or dying battery in your key fob. Replacing it is a simple DIY task that can save you time and money compared to visiting a dealership. However, before you rush out to buy a new battery, understanding the battery size for your key fob is crucial.
This guide will walk you through everything you need to know about key fob batteries, from identifying the correct size to replacing it yourself. We’ll cover the common types of batteries, how to find the right one for your specific fob, and provide step-by-step instructions for a smooth replacement process.
Why Knowing Your Key Fob Battery Size Matters
Imagine taking apart your key fob, only to realize you’ve bought the wrong battery. This not only leads to an extra trip to the store but also leaves your car keyless in the meantime. Knowing the correct battery size for your key fob beforehand ensures a quick and efficient replacement. Using the wrong size can prevent your key fob from working, even with a new battery. Key fobs are designed to work with specific battery types that provide the correct voltage and physical fit.
Common Key Fob Battery Sizes
While the specific battery size for your key fob can vary depending on your car’s make, model, and year, some sizes are more commonly used than others. Here are a few of the most frequent types you’ll encounter:
- CR2032: This is arguably the most common Battery Size For Key Fobs. It’s a 3V lithium coin cell battery known for its long life and reliability. Many car manufacturers, from Honda to Toyota, utilize CR2032 batteries in their key fobs.
- CR2025: Slightly thinner than the CR2032, the CR2025 is another 3V lithium coin cell battery that you might find in some key fobs. While it has a slightly lower capacity than the CR2032, it can still be a suitable battery size for key fobs designed for it.
- CR2450: Larger and with a higher capacity than the CR2032, the CR2450 is a 3V lithium coin cell battery used in key fobs that require more power or longer battery life. You may find this battery size for key fobs in some premium or newer vehicle models.
- CR1632: This 3V lithium coin cell is thinner and smaller in diameter than the CR2032. It’s used in smaller key fobs or those requiring a more compact battery solution. While less common than CR2032, it’s still a potential battery size for key fobs.
- CR1220 & CR1250: These are smaller 3V lithium coin cell batteries, sometimes found in older key fobs or those with very compact designs. For example, some Honda CR-V models use a CR1250 battery. It’s essential to verify if this is the correct battery size for your key fob if you own such a vehicle.
It’s important to note that while CR2032 is very common, your key fob might require a different size. Always double-check before purchasing a replacement.
How to Determine the Battery Size for Your Key Fob
There are a few ways to find out the correct battery size for your key fob:
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Check Your Key Fob Case: The easiest method is to look directly at your key fob. Many key fobs have the battery size embossed on the back of the case or inside the battery compartment. Look for markings like “CR2032,” “CR2025,” etc.
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Consult Your Owner’s Manual: Your vehicle’s owner’s manual is a valuable resource. It should contain information about your key fob, including the specific battery size required. Look for the section on “keyless entry system” or “remote control.”
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Open Your Key Fob (Carefully): If you can’t find the battery size externally or in your manual, you’ll need to open your key fob. Most key fobs can be carefully pried open using a thin, flat tool like a watch knife or a small screwdriver.
- Pry it Gently: Locate a small notch or seam on the key fob case. Insert your tool into the notch and gently twist or pry to separate the two halves of the case. Avoid forcing it, as you could damage the fob. Wedge your flathead screwdriver or watch knife around the outside of the case. Some key fob cases have a notch to help you get started. Once you have the first gap, wedge your pry tool around the case’s fasteners, like you’re peeling an apple or orange. It doesn’t take much pressure to pop the fasteners open.
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Identify the Old Battery: Once open, you’ll see the battery. The battery size is usually printed directly on the battery itself. Note down this size – for example, CR2032 – and use this information to buy your replacement.
Always take a picture of the key fob’s internals before removing the old battery. Car key fobs can vary significantly inside, even for the same year, make and model of car. This photo will be a helpful reference when you reassemble the fob, ensuring all parts go back in the correct place and orientation. You’ll also know for certain whether the positive side of the battery goes up or down.
Step-by-Step Guide to Replacing Your Key Fob Battery
Once you’ve identified the correct battery size for your key fob and purchased a replacement, here’s how to change it:
Tools You’ll Need:
- New key fob battery (correct size – e.g., CR2032)
- Small flat-head screwdriver or watch knife
- Tweezers (optional, but helpful)
Steps:
- Open the Key Fob: Following the instructions above, carefully pry open your key fob case.
- Locate the Battery: Once open, you’ll see the battery nestled inside.
- Remove the Old Battery: Some key fobs have clips or retainers holding the battery in place. Gently unclip or slide these to release the battery. You can use tweezers or your fingertip to carefully lift out the old battery. Do not disturb the wiring or circuit board inside your key fob. Avoid messing with the wiring inside, or else you might risk damaging the fob.
- Install the New Battery: Take your new key fob battery and insert it into the battery compartment. Ensure the polarity is correct – usually, the “+” side of the battery faces upwards, but refer to your photo if you took one or check for markings in the battery compartment.
- Reassemble the Key Fob: Carefully snap the two halves of the key fob case back together until they close securely. Ensure all parts are aligned correctly.
- Test Your Key Fob: Try using your key fob to lock and unlock your car to ensure the new battery is working correctly.
Tips for Choosing the Right Key Fob Battery
- Always Verify the Size: Double and triple-check the battery size for your key fob before buying. Refer to your fob, manual, or the old battery itself.
- Buy Quality Batteries: Opt for reputable brands of batteries to ensure longevity and reliability. Interstate Batteries is a trusted provider for both car batteries and key fob batteries.
- Check Expiration Dates: Like all batteries, key fob batteries have a shelf life. Check the expiration date on the packaging to ensure you’re buying a fresh battery.
- Consider Purchasing Spares: Key fob batteries are inexpensive and have a long shelf life. Consider buying a few extra to keep on hand, so you’re prepared for future replacements.
Conclusion
Replacing your key fob battery is a straightforward task that anyone can accomplish with the right knowledge and a little care. The most crucial step is identifying the correct battery size for your key fob. By following the steps outlined in this guide, you can confidently find the right battery, replace it yourself, and get your key fob working again in no time. For all your battery needs, including car and key fob batteries, remember to check out Interstate All Battery Center for reliable products and expert advice.
