Key Fob Battery Finder
Pick your make, model and year to see which coin battery your car key takes. Every key style for that model is listed, so you buy the right cell the first time.
Find your key fob battery
US models, 1996 to todayHow to use the key fob battery finder
- Select the make. Pick the brand on the badge of your car.
- Select the model. The list shows the models we have checked for that make.
- Add the year. This is optional. Leave it on “Any year” to see every key style.
- Match the key in your hand. Each result names a key style, such as flip key or smart key.
- Confirm before you buy. Open the key and read the code on the old battery.
Most car key fobs take a CR2032 coin battery. Slimmer keys often use a CR2025, CR2016, CR1620 or CR1616, and many newer flat smart keys from Ford, Toyota, Jeep and Ram use the larger CR2450. Use the finder above to check your make, model and year, then confirm the code printed on the old battery.
The same car can use two or three different batteries depending on the year and on whether it has a turn key or push-button start. A 2016 Ford F-150 smart key holds two CR2025 cells, while a 2019 takes one CR2450. That is why a quick search often gives you the wrong answer. The key fob battery finder above sorts it out by key style, so you buy the right cell the first time.
Why One Model Can Have Several Batteries
Carmakers do not tie a battery to a model. They tie it to a key design, and one model can be sold with several key designs at the same time.
- Trim level. A base trim with a turn-key ignition often gets a remote head key or flip key. Upper trims with push-button start get a smart key that holds a different cell.
- Mid-cycle updates. Makers change the key during a generation. Honda keyed models moved from CR1616 to CR1620 on many 2013 and newer keys, and Mazda switched its smart key from CR2025 to CR2032 around 2020.
- New flat smart keys. Larger keys with more range and remote start need more capacity, so many use a CR2450.
- Aftermarket keys. A replacement fob bought online may not use the same battery as the original, even if it works with the same car.
This is the reason the finder shows a year range and a key style together, and why the year ranges are marked as approximate.
Key Styles Explained
| Key style | What it looks like | Common batteries |
|---|---|---|
| Separate remote | A small remote on the key ring next to a plain metal key | CR2032, CR2016, CR2025 |
| Remote head key | Buttons built into the head of a metal key | CR2016, CR1616, CR1620, CR2032 |
| Flip key | Metal blade folds out of the fob at the press of a button | CR2032, CR1620 |
| Fobik | Plastic fob that plugs into the dash on Chrysler, Dodge, Jeep and Ram | CR2032 |
| Smart key | Fob for push-button start with a hidden emergency blade | CR2032, CR2025, CR1632, CR2450 |
Not sure which code is which size? The key fob battery size chart lists the diameter and thickness of each cell.
How to Confirm the Battery Yourself
The finder gives you the most likely answer. The old battery gives you the certain one. Here is the fastest way to check.
- Remove the emergency key blade if your fob has one.
- Twist a coin or a small flat screwdriver in the slot on the seam to open the case. Our guide on how to open a key fob shows the common designs.
- Read the code on the flat face of the cell, for example CR2032.
- Note which side faces up before you lift it out. The polarity guide explains why this matters.
- Check whether the fob holds one cell or two.
The owner’s manual also lists the battery type, usually in the section on keys and remote controls.
Can You Use a Different Battery Size?
Use the exact code the key was built for. A CR2025 and a CR2032 are the same width, but the CR2025 is 0.7 mm thinner, so it can sit loose and lose contact. A CR2032 will not replace two stacked CR2025 cells, and a CR2450 is too wide for a CR2032 holder. The full comparison is in CR2032 vs CR2025.
Avoid rechargeable LIR cells too. They look the same but run at a higher voltage than a key fob expects.
After You Find Your Battery
Changing the cell takes about five minutes on most keys. Follow the steps in how to replace a key fob battery, and replace both cells at once if your fob has two. You do not need to reprogram the key in most cars. If the fob still does not respond, see key fob not working after battery replacement.
Not sure the battery is the problem? Check the signs of a low key fob battery first.
About the Data in This Tool
The finder covers more than 60 popular models from 20 makes sold in the United States. The battery types come from owner’s manuals and from the keys themselves. Year ranges are approximate because trims and build dates overlap, and a previous owner may have fitted an aftermarket fob. Treat the result as a strong starting point and let the old battery have the final word.
Frequently Asked Questions
Most key fobs take a CR2032. Others use a CR2025, CR2016, CR1620, CR1616, CR1632 or CR2450. Select your make, model and year in the finder, then confirm the code printed on the old battery.
Check the owner’s manual in the section on keys or remote controls, or use the finder on this page. Opening the key and reading the old cell is still the most reliable check.
No. They are all 3 volt lithium coin cells, but the diameter and thickness differ. A cell that is the wrong size may not fit or may lose contact.
Your model was sold with more than one key style in those years, for example a flip key on base trims and a smart key on push-button trims. Match the description to your key.
In most cars, no. The key stays paired with the vehicle. If it does not respond, check the battery orientation and size first.
Usually two to four years. Smart keys for push-button start tend to drain faster than keys that only send a signal when you press a button.
