How do you change battery in key fob of Mercedes s320 year 1997?

To change the battery in a 1997 Mercedes S320 key fob, first, locate the small slot or notch on the side of the fob. Use a flathead screwdriver or a similar tool to gently pry open the fob casing. Once open, remove the old battery (usually a CR2025 or similar) and replace it with a new one, ensuring the positive side faces the correct direction. Finally, snap the fob back together and test it to ensure it works properly.