Pull out the mechanical key, and forcefully break off the shell of the key along the place where the mechanical key is placed. After opening the case, use a blade to pry the battery out. Replace the battery with a new one, and restore the shell of the remote control to its original state. The battery used in BYD f3 remote control key is CR1632 battery, and the spare key is CR2025.
How to use the BYD f3 key, lock the car, press the LOCK button, all the door lock motors perform a locking action at the same time, and the turn signal light flashes once. When looking for a car, when the vehicle is in the anti-theft state, press the LOCK button, you will hear a long beep and the turn signal lights will flash for 15 seconds. Press the LOCK button again in the state of looking for a car, and then enter the state of looking for a car again. The alarm is released. When the vehicle is in the alarm activation state of the anti-theft mode, press the LOCK button, no matter whether the door lock is opened or not, all the door lock motors will perform a locking action at the same time, and the alarm will be released at the same time. At this time, the vehicle is still in the anti-theft state. To unlock, press the UNLOCK button, all the doors will perform an unlocking action at the same time, and the turn signal lights will flash twice. If the vehicle is in the anti-theft state, press this button to unlock, and the turn signal lights will flash three times. When the key is on the ignition switch, it cannot be unlocked with the UNLOCK button.
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