What to Do When Your BYD Car Key Battery Dies?
2 Answers
If the car has a keyhole, you can use the mechanical key to start the vehicle. If not, the smart entry and smart start system warning light will illuminate, and a buzzer in the vehicle will sound once. Within 30 seconds after the buzzer sounds, bring the electronic smart key close to the "Start/Stop" button, and the buzzer will sound again to prompt starting the engine.
As a seasoned BYD driver for many years, I've encountered the issue of a dead key fob battery several times. Typically, the key uses a CR2032 coin cell battery, which is quite easy to replace yourself. First, use a small screwdriver or coin to gently pry open the back cover, being careful not to damage the plastic clips. Remove the old battery, noting the positive and negative orientation, and replace it with a new one in the same position. After securing the cover, test the unlock button—if the red light turns on, you're good to go. Even with a dead BYD key fob, you can still start the car in an emergency: locate the lock cylinder on the door, use the physical key to unlock it, then place the smart key close to the start button inside the car for a few seconds to ignite the engine. For prevention, I recommend checking the battery annually or keeping a spare in the car. Older vehicles may have shorter battery life, but replacement costs just a few bucks—though dealerships might charge more. In short, it's not a major issue, but addressing it early avoids being stranded.
