Car key battery experts
Find the exact battery for your key fob.
Search by vehicle or browse all 8 BatteryGuru sizes. We help you confirm the fit, order fast, and get back to a responsive remote.
Guided fitment
Select Your Vehicle
Choose your make, model, and year. We'll match your vehicle to the battery size that fits your remote.
Start with make, model, and year.
Review the recommended size or remote type.
Add a 2-pack to cart and choose shipping.
Know your size?
Shop All 8 Car Key Battery Sizes
Already checked the label inside your key fob? Pick the BatteryGuru size below and continue straight to the product page.
Search instead
Search Your Vehicle
Type a make, model, or year and select the closest match. If one vehicle has multiple remote types, we'll show each option clearly.
Customer reviews
Drivers Trust BatteryGuru
Helpful fitment guidance, simple ordering, and dependable replacement batteries for everyday key fob problems.
"The vehicle lookup took the guesswork out of it. I found the CR2032 for my key fob and checked out in a couple minutes."
"Clear product page, fair price, and the two-pack was exactly what I needed for both remotes."
"I wasn't sure which battery fit my SUV remote. The finder showed the right option and saved me a trip to the store."
"Fast, simple, and the checkout made the shipping options easy to understand."
Frequently asked questions
Car Key Battery Help
Quick answers for finding the right battery, replacing it safely, and ordering with confidence.
How do I know which battery fits my key fob?
Use the vehicle finder to choose your make, model, and year. If your vehicle has multiple remote types, we will show the matching battery options.
Can I search instead of using the dropdowns?
Yes. Use the vehicle search box to type a make, model, or year, then select your vehicle from the suggestions.
What if I already know my battery size?
Browse the 8 BatteryGuru sizes directly and choose the size printed on the coin cell inside your remote.
How many batteries come in a package?
BatteryGuru car key battery packages include two 3V coin cells, so you can replace one remote and keep a spare.
What are signs my key fob battery is weak?
Shorter range, intermittent lock or unlock response, repeated button presses, or a dashboard key battery warning are common signs.
What if I order the wrong size?
Check the shipping and return policy during checkout. BatteryGuru offers a 60-day return window for eligible items.