FobBattery is an independent review site that prides itself on unbiased reviews. I am not affiliated with any manufacturers and do not accept paid reviews. When you buy through my links, I may earn a commission which helps me purchase more key fobs for testing. - Scott
Welcome to FobBattery.com! We provide dozens of original videos, photos, and content on how to change car fob batteries! It’s not the most exciting of topics I know, but it’s been a labor of love to put together these guides. There are hundreds of different types of key fobs in existence, and we are working our way through all the major car brands to give you in-depth tutorials for all of them. Most key batteries are “CR” coin or key batteries – such as the CR 2450 key fob battery. My other major project is Hachi – a website to find the lowest price on dog food and other pet supplies.
Below is our current list of brands we have built out a database of batteries and fobs for, along with tutorials on how to fix or replace / change them on some of the most popular cars in the world. We also have a guide to changing the battery in the Tile Mate and Tile Pro devices.
Popular Key Battery Guides
- Honda Accord Key Battery
- Honda Civic Key Battery
- BMW 3 Series Key Fob Battery
- BMW 5 Series Key Fob Battery
- BMW X3 Series Key Fob Battery
- BMW X5 Series Key Fob Battery
- Ford F-150 Key Fob Battery
- Ford Explorer Key Fob Battery
- Ford Escape Key Fob Battery
- Ford Mustang key fob battery
- Scion xB Key Fob Battery
- Hyundai Santa Fe Key Fob Battery
- Hyundai Elantra Key Fob Battery
Key Fob Replacements
Common Fob Batteries
The most popular car key fob battery is the CR2032. This is the most popular car key fob battery in the world. The numbers in the battery indicate the size of the battery in diameter (wide) and height (tall). So the 2032 battery is 20mm wide and 3.2mm tall. The C indicates a lithium chemistry battery. The R indicates the shape: Round.
Other common “button batteries” for key fobs include:
- How-to replace a battery in a key fob
- Changing a BMW Comfort Access key fob battery vs non Comfort Access
Check out a few of our how-to guides on our Pinterest page.