What Type of Battery Does a Car Key Use?

[MiguelMarie]

Car keys typically use the following types of batteries: 1. CR2016 coin cell battery; 2. CR2025 coin cell battery; 3. Alkaline 12V battery. The steps to replace a car key battery are: 1. Remove the mechanical key; 2. Insert a flat-head screwdriver into the OPEN slot at the bottom and gently pry up and down; 3. Once a gap appears, use the screwdriver to carefully pry open the key along the gap; 4. Remove the old battery and replace it with a new one; 5. Reassemble the key. The working principle of a car key is: it emits a weak radio wave from the owner, which is received by the car's antenna. The electronic control unit then identifies the signal code, and the system's actuator performs the locking or unlocking action.