What Kind of Battery Does Your Car Key Fob Take? A Comprehensive Guide

Car key fobs are indispensable in modern vehicles, offering convenience and security at your fingertips. However, these devices rely on a small battery to function, and knowing What Kind Of Battery Does A Car Key Fob Take is crucial for every car owner. Imagine being stranded because your key fob battery died unexpectedly. This article will equip you with the knowledge to understand your car key fob battery, recognize the signs of a dying battery, and confidently replace it yourself.

Recognizing the Signs of a Dying Car Key Fob Battery

Just like any battery-powered device, your car key fob’s battery will eventually deplete. Being aware of the warning signs can prevent you from being caught off guard. Here are common indicators that your car key fob battery is getting weak and might need replacing soon:

Reduced Range: This is often the first and most noticeable sign. You’ll find you need to be much closer to your car than usual for the remote to work. If you used to be able to unlock your car from a distance, and now you have to be right next to it, battery weakness is likely the culprit.
Inconsistent Signal: You press the unlock or lock button, but nothing happens. You might have to press the button multiple times, or press it harder than usual, to get a response from your vehicle. This unreliable signal indicates a power issue.
No Signal at All: In the most extreme case, your key fob might stop working altogether. The buttons become unresponsive, and your car doesn’t react to any commands from the remote. This usually signifies a completely dead battery.
Dashboard Warning Light: Some newer vehicles are equipped with a dashboard warning light specifically for a low key fob battery. If you see a key symbol with a low battery indicator on your dashboard, it’s a clear signal to replace the battery soon.

If you experience any of these symptoms, it’s wise to address the issue promptly and replace your car key fob battery. Ignoring these signs could lead to inconvenience and potential frustration when you least expect it.

Common Car Key Fob Battery Types

When it comes to what kind of battery does a car key fob take, there isn’t a single answer. However, most car key fobs utilize coin cell batteries, also known as button cell batteries. These small, round batteries are designed for low-power, compact electronic devices like key fobs. While various types exist, two battery sizes are overwhelmingly common in car key fobs:

CR2032 Battery: This is perhaps the most frequently used battery type in car key fobs across a wide range of car manufacturers and models. The “CR” designation indicates it’s a lithium battery, and “2032” refers to its dimensions – 20mm in diameter and 3.2mm in thickness. The CR2032 battery offers a good balance of power and longevity, making it a reliable choice for key fobs.
CR2025 Battery: Another common type, the CR2025 battery is very similar to the CR2032. It shares the same 20mm diameter but is slightly thinner at 2.5mm thickness. While it might have a slightly lower capacity than the CR2032, it still provides sufficient power for most car key fob functions and is often used in slimmer fob designs.
CR2016 Battery: Thinner still is the CR2016, measuring 20mm in diameter and 1.6mm thick. This battery type is used in even more compact key fobs or where a thinner profile is desired. It may have a shorter lifespan compared to CR2032 or CR2025 due to its reduced size and capacity.
CR2450 Battery: For key fobs requiring more power or longer battery life, the CR2450 is sometimes used. This battery is larger, measuring 24.5mm in diameter and 5.0mm thick. Its increased size allows for a higher capacity and extended performance.

While these are the most common types, other less frequent battery sizes can be found in certain car models or older key fobs. Always verify the correct battery type for your specific key fob before purchasing a replacement.

Finding the Right Battery for Your Car Key Fob

Knowing the common types is helpful, but determining the exact battery your car key fob needs is crucial. Here are several reliable ways to find out what kind of battery does your car key fob take:

Consult Your Owner’s Manual: Your vehicle’s owner’s manual is the most definitive source of information. Locate the section on key fobs or remote controls, and it should specify the exact battery type required for your key fob. This is the most reliable method, ensuring you get the correct battery size and voltage.
Check the Existing Battery: Carefully open your key fob (refer to your owner’s manual or online guides for instructions specific to your key fob model). Once opened, you will see the battery installed. The battery type is usually printed directly on the battery itself. Note down the code (e.g., CR2032, CR2025) and voltage (usually 3V).
Online Battery Finders and Compatibility Charts: Many battery retailers and websites offer online tools to help you find the correct battery. You can often enter your car’s make, model, and year, and the tool will identify the compatible key fob battery. Reputable online retailers like battery manufacturers’ websites or automotive parts stores often have these resources.
Visual Inspection and Comparison: If you have a new battery you suspect might be compatible, visually compare it to your old battery. Ensure the diameter and thickness are the same or very close. While slight variations might sometimes work, it’s best to match the size exactly for optimal fit and performance.

Caution: Always handle small batteries with care. Keep them away from young children as they can be a choking hazard. Dispose of old batteries properly according to local regulations.

Step-by-Step Guide to Replacing Your Car Key Fob Battery

Replacing a car key fob battery is generally a straightforward DIY task that can save you time and money compared to visiting a dealership or locksmith. Here’s a general guide to help you through the process:

Gather Your Tools and Supplies: You’ll need a new battery of the correct type for your key fob and a small flathead screwdriver or a similar prying tool. A soft cloth or plastic pry tool can help prevent scratches on the fob casing.
Open the Key Fob Casing: Examine your key fob for a small notch or seam. This is usually where you need to pry it open. Some fobs have a small screw that needs to be removed first. Refer to your owner’s manual or search online for instructions specific to your car model and key fob type.
Carefully Pry Open the Fob: Using your flathead screwdriver or pry tool, gently insert it into the notch or seam and twist or lever to separate the two halves of the key fob casing. Be careful not to apply excessive force, as you could damage the plastic clips or housing. Work your way around the seam if needed until the fob opens.
Locate and Remove the Old Battery: Once the fob is open, you’ll see the battery. Note the orientation of the battery (which side is facing up). Gently pry the old battery out of its compartment. You may be able to use your fingertip or the edge of your tool.
Install the New Battery: Take your new battery and insert it into the battery compartment, ensuring you match the correct orientation (usually the “+” side facing up, but double-check the markings in the battery compartment). Press down firmly until the battery is securely in place.
Reassemble the Key Fob: Carefully align the two halves of the key fob casing and press them back together until they snap securely. Ensure there are no gaps and the fob is properly closed. If you removed a screw earlier, replace it now.
Test Your Key Fob: Try using your key fob to lock and unlock your car, start the engine (if it’s a push-to-start vehicle), and test any other remote functions. If everything works as expected, you’ve successfully replaced your car key fob battery!

Note: If your key fob still doesn’t work after replacing the battery, double-check that you used the correct battery type, installed it with the correct orientation, and that the battery is fresh. If issues persist, you may need to consult a locksmith or your car dealership for further assistance.

Car Key Fob Battery Types by Vehicle Make (Examples)

While CR2032 and CR2025 are prevalent, specific car makes and models may use different batteries. Here are some examples to illustrate what kind of battery does a car key fob take for various manufacturers:

Honda: Many Honda models, such as the Accord, Civic, and CR-V, commonly use the CR2032 battery. However, some Honda remote head keys (RHK) might use CR1620.
Nissan: Nissan vehicles like Altima, Murano, Pathfinder, and Sentra often utilize the CR2032 battery in their key fobs.
Toyota: Toyota models like Camry, Corolla, Highlander, and RAV4 frequently use the CR2032 battery for smart keys. Some Toyota remote head keys (RHK) may use CR2016, while certain models like Sienna and Venza use the larger CR2450.
Mazda: Mazda models including Mazda 3, Mazda 6, CX-5, and CX-9 typically employ the CR2032 battery in their key fobs.
Jeep: Jeep Grand Cherokee, Compass, and Renegade often use CR2032 batteries. However, some Jeep models like Grand Wagoneer and Wrangler may use the CR2450.
Subaru: Subaru Impreza, Legacy, and Outback smart keys commonly use CR2032 batteries, while some Subaru remote head keys (RHK) might use CR1620.

Disclaimer: This is not an exhaustive list, and battery types can vary even within the same car make depending on the specific model year, trim level, and key fob type. Always verify the correct battery for your specific vehicle using the methods mentioned earlier (owner’s manual, checking the old battery, online tools).

Cost and Where to Buy Car Key Fob Batteries

Car key fob batteries are inexpensive and readily available. A single replacement battery typically costs around $5 or less. You can purchase them from various sources:

Online Retailers: Amazon, Walmart, and other online marketplaces offer a wide selection of coin cell batteries, often at competitive prices. You can easily search for the specific battery type you need (e.g., “CR2032 battery”) and have it delivered to your door.
Electronics Stores: Stores like Best Buy, electronics supply stores, and battery specialty shops carry a variety of coin cell batteries, including those commonly used in car key fobs.
Drugstores and Grocery Stores: Many drugstores and supermarkets also have a section with batteries, and you can often find CR2032, CR2025, and similar types there.
Automotive Parts Stores: Auto parts stores like AutoZone, Advance Auto Parts, and O’Reilly Auto Parts are another convenient source for car key fob batteries. They are likely to stock the common types and can also offer assistance in finding the right battery.

Before buying, ensure you know what kind of battery does your car key fob take to avoid purchasing the wrong type. Checking the battery type beforehand will save you time and ensure a successful replacement.

Conclusion

Understanding what kind of battery does a car key fob take and how to replace it is a valuable skill for any car owner. By recognizing the signs of a dying battery and knowing where to find the correct replacement, you can maintain the convenience and functionality of your car key fob and avoid potential headaches. Replacing the battery yourself is a simple and cost-effective solution, but if you prefer professional assistance, locksmiths specializing in automotive services, like Keyway Lock Service, are always available to help. Don’t let a dead key fob battery leave you stranded – be proactive and keep your key fob powered up!