Like anything else relying on a battery, you car key fob can die—often at the worst time. Thankfully, these batteries are easy to replace.

How to replace car key battery Most key fobs have a little slot you can use to pop them open with a small flatheaded screwdriver, a butter knife or another key.

Stick with us as we’ll cover the symptoms of a dead fob battery, how to test it, how to change the key fob battery, and how to repogram a key fob after replacing the battery.

There’s usually a mechanical key hiding inside the key fob for cars with push-button start systems, so you can still unlock your door if the car battery or your fob battery runs out of juice.

If the battery in your car key fob has died, here's how to replace it – including the type of battery you'll need and the cost involved.

And that’s just for the fob. Add another $50 to $100 to get replacement fobs programmed to work with your car and to have a new mechanical backup key made.