Is your car key fob starting to feel a little… unresponsive? You press the unlock button, and nothing happens on the first try? It might be more than just impatience; it could be a sign that your key fob battery is dying. Before you rush to a dealership or auto repair shop, know this: replacing your key fob battery is often a simple DIY task. And the first step to success? Knowing the correct Key Fob Battery Size.
While swapping out a key fob battery is considerably easier than wrestling with your car’s main battery, getting the right replacement battery is crucial. Using the wrong size can lead to poor contact, malfunction, or even damage to your key fob. This guide, brought to you by the auto experts at keyfobx.com, will walk you through everything you need to know about key fob battery sizes and how to ensure you pick the perfect one for your car.
Finding Your Key Fob Battery Size: Your Options
So, how do you determine the key fob battery size you need? You have a couple of straightforward options:
1. Check Your Key Fob Case
Your key fob itself might hold the answer. Many manufacturers emboss the battery size directly onto the key fob casing. Take a close look at the back of your key fob or even inside the key sleeve if it has one. You might find a series of letters and numbers – this is often your key fob battery size designation.
Common markings to look for include codes like CR2032, CR1632, CR2025, or similar combinations. These codes are industry standards that specify the battery’s dimensions and chemistry.
2. Open Your Key Fob and Take a Look
If your key fob doesn’t have the battery size printed on the outside, don’t worry. It’s still relatively easy to find out. You’ll need to carefully open your key fob case. For this, you’ll typically need:
- A thin, flat tool: A watch knife or a small flathead screwdriver works well.
- Precision screwdrivers: Some fobs use tiny screws to secure the case.
- Tweezers (optional): Helpful for handling the small battery.
Here’s a step-by-step on how to open your key fob to identify the battery size:
- Inspect for Screws: Check if your key fob has any tiny screws holding the case together. If so, use the appropriate precision screwdriver to remove them and set them aside safely.
- Locate the Opening Notch or Seam: Most key fobs have a small notch or seam somewhere along the edge of the case. This is your starting point.
- Gently Pry Open the Case: Insert your thin blade or flathead screwdriver into the notch or seam. Apply gentle pressure and carefully wedge the tool around the perimeter of the case. Work slowly and avoid forcing it, as you could damage the plastic.
- Take a Picture (Crucial Step!): Before you remove the battery, take a clear photo of the inside of the key fob, especially the battery compartment. This picture will be invaluable when you reassemble everything, ensuring you put the new battery in correctly (polarity matters!).
- Identify the Battery Size: Once open, you’ll see the battery. The key fob battery size will be printed directly on the battery itself. Note this code down.
Common Key Fob Battery Sizes
While there are various key fob battery sizes, some are far more common than others. Knowing these common sizes can help you narrow down your search:
- CR2032: This is by far the most frequently used key fob battery size. It’s a 3V lithium coin cell battery that is compact yet powerful. You’ll find CR2032 batteries in a vast range of car makes and models.
- CR2025: Another common 3V lithium coin cell, the CR2025 is slightly thinner than the CR2032 but has the same diameter. It’s often used in slimmer key fobs.
- CR1632: This 3V lithium battery is smaller in diameter and thickness than the CR2032 and CR2025. It’s used in more compact key fobs.
- CR1620: Similar to the CR1632 but slightly thinner, also a 3V lithium coin cell.
- CR1220 & CR1225: These are smaller 3V lithium coin cells, less common but still found in some key fobs.
- CR2450: A larger 3V lithium coin cell, offering higher capacity for key fobs with more features.
It’s worth noting that while most key fobs use a single battery, some, like certain Ford Mustang key fobs, may require two batteries. Always verify the number of batteries needed when you open your fob. And remember, while the CR2032 is extremely common, models like Honda CR-V might use a CR1250. Always double-check your specific key fob for the correct battery size.
Replacing Your Key Fob Battery: Quick Steps
Once you’ve identified the correct key fob battery size, the replacement is a breeze:
- Remove the Old Battery: Use tweezers or your fingers to carefully lift out the old battery. Note the polarity (+ and – sides).
- Insert the New Battery: Place the new battery in the compartment, matching the correct polarity as indicated in your photo or by markings in the fob case.
- Reassemble the Key Fob: Carefully snap the key fob case back together. If there were screws, re-insert and tighten them gently.
- Test Your Key Fob: Try locking and unlocking your car to ensure the new battery is working correctly.
Getting the Right Key Fob Battery Size Matters
Using the correct key fob battery size is essential for optimal performance and longevity of your key fob. A battery that is too small might not make proper contact, leading to intermittent operation. A battery that is too large might not fit, potentially damaging the key fob’s internal components.
By taking a few minutes to identify the right key fob battery size using these methods, you can save yourself time, frustration, and potential damage. And remember, for all your automotive battery needs, including key fob batteries, keyfobx.com is your trusted resource.
