Watch this video to see how to change the battery in your key fob. 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 ...

Worst: Mini Key Fob This does not apply to the latest generation of the iconic hatch, as Mini finally came to its senses and started including a fairly normal pill-shaped key fob.

The key fob (or back in the day, simply the key) is the only part of a car you're likely to have on you all the time.

Key fobs have been common for years, but now, some cars don't even come with physical keys. While keyless systems are convenient, though, there are downsides.

A look at the evolution of car keys, from crank-start days to app-based access, and the most brilliant and baffling designs ever made along the way.