How to Replace the Battery in a BMW Key?
2 Answers
Method for replacing the battery in a BMW key: 1. Remove the mechanical key to reveal two holes—one for the mechanical key and another for removing the key cover plate. 2. Insert the mechanical key into the hole for removing the cover plate and gently pry it open using the lever principle to access the battery compartment. 3. Use a toothpick to remove the old battery and insert a new one. 4. Reassemble the key by following the reverse order of disassembly, placing the mechanical key back into the car remote key. BMW cars refer to vehicles produced by BMW AG, with main series models including the 1, 2, 3, 4, 5, 6, 7, and 8 series.
I've been driving a BMW for several years and am quite skilled at replacing key fob batteries. I remember learning this at a car club meetup for the first time: First, check the back of the key—there's usually a small groove or gap. Use a coin or a small flathead screwdriver to gently pry open the casing. Don't apply too much force to avoid cracking the plastic. Inside, the old battery is typically a round coin cell, most commonly a CR2032, which you can buy at local convenience stores or online. Carefully remove the old battery, noting its orientation (positive side up), as installing the new battery backward may cause malfunction. After inserting the new battery, press the cover back gently and test the unlock and ignition functions. The whole process takes just 5 minutes, saving you a trip to the dealership. However, I recommend using a dry cloth to keep the key clean and avoid water contact. Regularly check the battery life and replace it promptly to prevent unexpected failures.
