How do you replace 1998 bmw z3 key battery?

To replace the battery in a 1998 BMW Z3 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 the fob open. Once opened, remove the old battery, typically a CR2016 or CR2025, and insert the new battery with the correct polarity. Finally, snap the fob back together securely.