Note: The remote control uses a CR2032 battery.
1. Using a thin slotted screwdriver, pry from the corner and separate the cover from the key body...
...and open the remote control.
Warning! To avoid damage to the remote control, do not touch the electronic board located in the cover.
2. Using a screwdriver, carefully pry the battery out of the key housing.
3. Install the new battery, observing the polarity ("+" faces inside the key body).
4. Put the cover back in place and press it until it clicks into place.