Key fobs are indispensable in modern vehicles, offering convenience and security at our fingertips. These small devices rely on batteries to function, and understanding what kind of battery your key fob takes is essential for every car owner. If your key fob starts acting up, knowing the right battery to replace it with can save you time and hassle. This guide will delve into the world of key fob batteries, covering types, lifespan, and how to determine the correct one for your car.
Understanding the power source of your key fob is the first step in maintaining its functionality. Key fobs primarily use small, coin-like batteries known as button cell batteries. These batteries are compact yet powerful enough to operate the remote functions of your car key, from locking and unlocking doors to starting the engine in push-to-start vehicles. Without a functioning battery, your key fob becomes essentially useless for remote operations, and in some cases, can even prevent your car from starting altogether.
Decoding Key Fob Batteries: Types and Specifications
When it comes to “What Kind Of Battery Do Key Fobs Take,” the answer isn’t always straightforward, but there are common types. Most key fobs utilize lithium coin cell batteries due to their long life and stable power output. The most frequently encountered types are CR2032, CR2025, CR2016, and CR2450. The “CR” designation indicates a lithium battery with a round shape, while the numbers specify the battery’s dimensions.
- CR2032: This is arguably the most common key fob battery. It measures 20mm in diameter and 3.2mm in thickness. Its popularity stems from its excellent balance of size and energy capacity.
- CR2025: Similar in diameter to the CR2032 (20mm), the CR2025 is slightly thinner at 2.5mm. It offers a good lifespan but generally has a slightly lower capacity than the CR2032.
- CR2016: Again, 20mm in diameter, but even thinner at 1.6mm. The CR2016 is used in slimmer key fobs where space is a premium.
- CR2450: Larger in both diameter (24.5mm) and thickness (5.0mm), the CR2450 provides a higher energy capacity and is used in key fobs requiring more power or longer battery life.
An image showing the inside of a prox car key, highlighting the battery compartment.
All these batteries are typically 3-volt batteries, providing the necessary power for your key fob’s transmitter to communicate with your vehicle. While these are the most common, it’s crucial to verify the specific battery type required for your key fob, as using the wrong type can lead to malfunction or damage.
Recognizing the Signs of a Dying Key Fob Battery
Knowing when your key fob battery is nearing the end of its life is crucial to prevent being caught off guard. Several telltale signs indicate it’s time for a replacement. One of the earliest indicators is a reduced operating range. If you find yourself needing to be significantly closer to your car for the remote to work, the battery is likely weakening.
Other common symptoms include:
- Inconsistent Signal: You press the button, but the car doesn’t respond immediately or at all.
- Repeated Button Presses: You need to press the buttons multiple times for the car to acknowledge the signal.
- No Signal at All: In the most obvious case, the key fob stops sending any signal, and the remote functions cease to work.
Ignoring these warning signs can lead to complete battery failure, potentially leaving you unable to remotely unlock or start your vehicle. Addressing these issues promptly by replacing the battery is a simple yet effective way to maintain the convenience and security your key fob provides.
Finding the Right Battery for Your Key Fob: A Step-by-Step Approach
Determining “what kind of battery do key fobs take” for your specific vehicle is a straightforward process. There are several reliable ways to identify the correct battery type:
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Consult Your Owner’s Manual: The most definitive source of information is your vehicle’s owner’s manual. Typically found in the glove compartment, the manual contains detailed specifications about your car, including the correct key fob battery type. Look for the section on key fobs or remote entry systems.
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Examine the Existing Battery: If you’re comfortable opening your key fob, you can directly inspect the battery currently inside. Carefully disassemble the fob (usually by prying it open with a small screwdriver or coin – refer to your manual or online guides for specific instructions for your key fob model). Once open, the battery type will be printed directly on the battery itself. Make a note of this code (e.g., CR2032) before removing the old battery.
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Online Battery Finders and Compatibility Charts: Many battery retailers, both online and in physical stores, offer battery finders or compatibility charts. These tools allow you to input your car’s make, model, and year to identify the correct key fob battery. Websites specializing in batteries or automotive parts are excellent resources.
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Vehicle-Specific Guides: As a resource for our readers, we’ve compiled a list of common car makes and models with their corresponding key fob battery types. While not exhaustive, this list covers many popular vehicles and can serve as a quick reference. (See the list below for examples from the original article)
It’s always best to double-check the battery type before purchasing to ensure compatibility and avoid any issues.
Car Key Battery Types by Vehicle Make (Examples)
To give you a clearer idea of “what kind of battery do key fobs take” across different car brands, here are some examples based on common inquiries:
Honda Key Fob Battery (Examples):
- 2022 Honda Insight – CR2032
- 2021 Honda Accord Hybrid – CR2032
- 2021 Honda Civic Smart Key – CR2032
- (17-21) Honda Civic RHK (remote head key) – CR1620
Image depicting unscrewing a Honda Remote Head Key (RHK) to access the battery.
Nissan Key Fob Battery (Examples):
- 2022 Nissan Altima – CR2032
- 2022 Nissan Murano – CR2032
- 2021-2022 Nissan Sentra – CR2032
Toyota Key Fob Battery (Examples):
- 2021-2022 Toyota Camry – CR2032
- 2021 Toyota RAV4 – CR2032
- 2022 Toyota Sienna – CR2450
Mazda Key Fob Battery (Examples):
- 2021 Mazda 3 – CR2032
- 2021 Mazda CX-5 – CR2032
- 2021 Mazda MX-5 Miata – CR2032
Jeep Key Fob Battery (Examples):
- 2022 Jeep Grand Wagoneer – CR2450
- 2021 Jeep Wrangler – CR2450
- 2021 Jeep Cherokee – CR2032
Subaru Key Fob Battery (Examples):
- 2021-2022 Subaru Outback – CR2032
- 2021 Subaru Forester (RHK) – CR1620
- 2021 Subaru Impreza (smart key) – CR2032
This is just a small sample, and battery types can vary even within the same car make depending on the model year and specific key fob design. Always verify the exact battery for your vehicle using one of the methods mentioned earlier.
Replacing Your Key Fob Battery: A Quick DIY Task
Once you’ve determined “what kind of battery do key fobs take,” replacing it is usually a simple do-it-yourself task. You’ll need a replacement battery of the correct type and a small flathead screwdriver or coin to open the key fob casing.
General Steps (Always refer to your vehicle/key fob specific instructions):
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Open the Key Fob: Locate the small notch or seam on your key fob. Use the screwdriver or coin to gently pry the casing open. Some fobs may have screws that need to be removed first.
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Remove the Old Battery: Carefully take out the old battery, noting its orientation (+ and – sides). It might be held in place by small clips.
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Insert the New Battery: Install the new battery in the same orientation as the old one. Ensure it’s securely seated in the battery compartment.
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Close the Key Fob: Snap the key fob casing back together until it’s firmly closed. If there were screws, re-install them.
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Test the Key Fob: Test the remote functions to ensure the new battery is working correctly.
Image showing an opened Honda RHK key fob with the battery compartment visible.
While DIY replacement is often easy, if you’re uncomfortable or encounter difficulties, professional locksmiths specializing in automotive keys can assist with battery replacement and other key fob services.
Cost and Where to Purchase Key Fob Batteries
Key fob batteries are inexpensive and readily available. A single replacement battery typically costs around $5 or less, depending on the type and retailer. You can purchase them at:
- Online Retailers: Amazon, battery specialist websites, and automotive parts websites.
- Local Stores: Walmart, AutoZone, electronic stores, drugstores, and some grocery stores often carry common coin cell batteries.
Purchasing batteries in multi-packs can sometimes offer a slight cost saving, especially if you have multiple vehicles or want to have spares on hand.
Conclusion: Staying Powered Up
Understanding “what kind of battery do key fobs take” is a small but important aspect of car ownership. By knowing the common battery types, recognizing the signs of a dying battery, and knowing how to find the right replacement, you can ensure your key fob remains a reliable tool. Regular battery replacement is a simple and cost-effective way to avoid key fob malfunctions and maintain the convenience and security features of your vehicle. For any key fob issues or if you prefer professional assistance, remember that automotive locksmith services are available to help keep you powered up and on the road.
