How to Replace the Battery in a BMW Key?
4 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.
The first time I changed the BMW key battery myself, as a beginner, I was quite nervous. After watching a YouTube video: There's a small notch near the button on the back of the key, just insert a dime coin and gently pry it open. Once opened, you can see the button battery. Remove the old battery carefully without losing it, then buy the same type at the supermarket (usually CR2032 or similar). When installing the battery, pay attention to the positive and negative sides; generally, the side with text faces down. Gently close the shell and press the test button to see if the car lights flash. It's really simple and saves money—just 10 yuan to do it yourself, while the 4S store charges dozens of yuan for service. It's also recommended to buy a spare battery to keep in the car, so you don't have to wait until it's completely dead to replace it.
As a money-saving expert, I always DIY: replacing the BMW key battery is super easy. First, buy a CR2032 battery, which only costs a few bucks. The back of the key is cleverly designed—some require a coin to pry open the slot. After opening the shell, remove the old battery. Before installing the new battery, wipe the contacts to ensure good connection. Test the functions after replacement; if everything works, you save dozens of dollars. Batteries from battery stores are cheaper than those from 4S shops, and you can also learn some new skills. Remember to buy branded batteries for longer lifespan.
