It’s a common scenario: you’re standing by your car, pressing the unlock button on your key fob repeatedly, but nothing happens. Before you assume the worst, consider the simplest solution: the battery in your key fob might be dead. Just like any other battery, key fob batteries wear out over time, and knowing What Batteries Are In Key Fobs and how to replace them can save you time and money.
Replacing your car key fob battery might seem daunting, but it’s often a straightforward task you can handle yourself. While dealerships and auto repair shops offer this service, understanding the process empowers you to take control. This guide will walk you through the types of batteries commonly found in key fobs, how to identify the right one for your vehicle, and the simple steps to replace it yourself.
Understanding the Common Types of Key Fob Batteries
Key fobs primarily rely on small, button-shaped batteries known as coin cell batteries. These batteries are favored for their compact size, long shelf life, and consistent power output, ideal for the low-drain, intermittent use of key fobs. While various types exist, some are more prevalent in car key fobs than others.
The CR2032 battery is arguably the most common type found in key fobs across various car manufacturers. Its popularity stems from its balance of size, capacity, and availability. Other frequently used types include CR1632, CR2025, and CR2450. The “CR” designation indicates a lithium battery, and the numbers represent the battery’s dimensions – the first two digits are the diameter in millimeters, and the last two indicate the thickness in tenths of a millimeter. For example, a CR2032 battery is 20mm in diameter and 3.2mm thick.
It’s also important to note that some key fobs may require different battery types depending on the vehicle’s make, model, and year. For instance, while CR2032 is widely used, certain models might utilize a CR1225 or even require multiple batteries to operate. Therefore, correctly identifying the battery type needed for your specific key fob is the crucial first step in any replacement.
Identifying the Right Battery for Your Key Fob
Before you rush out to buy a replacement, take a moment to determine exactly what batteries are in your key fob. There are a few ways to find this information:
1. Check Your Key Fob Casing: Many key fobs have the battery type embossed directly on the back of the casing or inside the battery compartment. Look closely for markings like “CR2032,” “CR1632,” or similar designations. This is often the quickest and easiest way to identify the correct battery.
2. Consult Your Vehicle’s Owner’s Manual: Your car’s owner’s manual is a valuable resource for all sorts of information, including the type of battery your key fob requires. Look in the index or the section on key fobs and remote entry systems.
3. Open Your Key Fob (Carefully): If you can’t find the battery type externally or in your manual, you’ll need to open your key fob. This process is usually simple but requires care to avoid damaging the casing.
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To open your key fob:
- Gather your tools: You’ll typically need a small flathead screwdriver or a watch knife.
- Locate the notch or seam: Examine the edge of your key fob for a small notch or seam where the two halves of the casing meet.
- Gently pry it open: Insert the tip of your screwdriver or watch knife into the notch and gently twist or pry to separate the casing. Work your way around the seam, applying gentle pressure until the case pops open. Avoid forcing it, as this could damage the plastic.
- Identify the battery: Once open, you’ll see the battery. Note the type printed on the battery itself. It’s also a good idea to take a picture of the battery orientation before removing it, ensuring you install the new one correctly.
4. Online Resources: If you’re still unsure, online resources can help. Websites specializing in key fob batteries or automotive parts often have battery finders where you can input your car’s make, model, and year to identify the correct key fob battery.
Step-by-Step Guide to Replacing Your Key Fob Battery
Once you’ve determined what batteries are in your key fob and have the correct replacement battery, the process is usually quick and easy. Here’s a step-by-step guide:
Tools You’ll Need:
- New Key Fob Battery: Ensure you have the correct type (e.g., CR2032).
- Small Flathead Screwdriver or Watch Knife: For opening the key fob case.
- Precision Screwdriver (Optional): Some fobs have tiny screws.
- Tweezers (Optional): For handling the battery, especially smaller types.
Steps:
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Open the Key Fob: Following the instructions in the previous section, carefully open your key fob casing.
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Remove the Old Battery: Once the fob is open, you’ll see the battery. It might be held in place by small clips or pressure. Gently use your fingertip or tweezers to lift the old battery out. Pay attention to the battery’s orientation – note which side is facing up (+ or -).
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Insert the New Battery: Place the new battery into the compartment, ensuring the polarity matches the original orientation (usually the “+” side facing up). Push it gently until it’s securely in place.
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Close the Key Fob: Carefully snap the two halves of the key fob casing back together. Ensure they are firmly closed and all edges are aligned. You should hear a click as the case seals. If your fob has screws, tighten them gently.
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Test Your Key Fob: Press the buttons on your key fob to test if it’s working. The car doors should lock/unlock, and the panic button should function.
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Tips for Key Fob Battery Maintenance and Longevity
To maximize the lifespan of your key fob battery and avoid unexpected failures, consider these tips:
- Avoid Extreme Temperatures: Extreme heat or cold can shorten battery life. Avoid leaving your key fob in direct sunlight or freezing temperatures for extended periods.
- Store Spare Fobs Properly: If you have a spare key fob, store it in a cool, dry place away from extreme temperatures.
- Recognize Low Battery Signs: Pay attention to the range and responsiveness of your key fob. If you need to get closer to your car or press buttons multiple times, it’s likely a sign of a weakening battery. Replacing it proactively can prevent complete failure at an inconvenient time.
Understanding what batteries are in key fobs and how to replace them is a simple yet valuable skill for any car owner. By taking a DIY approach, you can save money and ensure your key fob is always ready to unlock your car when you need it.
