Car Keyfob Batteries

A car key fob is a small electronic device used to remotely control various functions of a vehicle, such as unlocking doors, starting the engine, or activating the car's alarm. It often works via radio frequency (RF) or infrared signals.

Most car key fobs use a CR2032 coin cell battery, though some models use a CR2025, CR2016, or CR1632 depending on the make and year of the car. Check the back of your key fob or your car's owner manual to confirm the correct battery type before purchasing.

A car key fob battery typically lasts between 3 and 5 years, depending on how often you use it and the quality of the battery. Premium lithium coin cell batteries tend to last longer than budget alternatives.

To change the battery:

Open the key fob: Most fobs have a small screw or can be pried open with a flat tool.

Remove the old battery: Carefully take out the old battery and note the orientation of the positive and negative sides.

Insert the new battery: Insert the new battery, making sure the positive side is in the correct direction.

Close the fob: Snap the key fob back together or screw it closed.

Common signs include having to press the button multiple times for it to work, needing to hold the fob closer to the car, or your car displaying a "low key battery" warning on the dashboard. Some cars will also beep or show a warning light when the fob battery is running low.

Yes — in most cases replacing a car key fob battery is a simple DIY job. You usually just need a small flat-head screwdriver or a coin to open the fob, swap the battery, and click it back together. The whole process takes less than two minutes.