How to Replace the Battery in a BMW Key?
3 Answers
BMW key battery replacement method is: 1. Remove the mechanical key; 2. Insert the mechanical key into the gap at the bottom of the key to pry open the shell; 3. Use a card to pry out the old battery and insert the new battery. Taking the 2021 BMW 1 Series 120mi Sport Edition as an example, its body dimensions are: length 4462mm, width 1803mm, height 1446mm, wheelbase 2670mm, and curb weight 1385kg. The 2021 BMW 1 Series 120mi Sport Edition is equipped with a 1.5L 4-cylinder turbocharged engine, using direct injection fuel supply, matched with a 7-speed dual-clutch transmission, and the body structure is a unibody design.
Last time my BMW key remote stopped working, and battery depletion was the common cause, so I replaced it myself. The first step was to locate the clips on the back cover of the key, usually using a coin or a small screwdriver to gently pry open the cover—don't use too much force to avoid damaging the plastic casing. Then, I removed the old battery; BMW keys typically use a CR2032 coin cell, making sure the positive side faces up to avoid reversing it. A new battery can be bought for just a few dollars at a supermarket or online. After inserting the new battery, I pressed the key to test if the car lock responded again. Finally, I snapped the cover back on and pressed it gently to secure it. The whole process took just a few minutes, saving me the hundred-dollar cost of a dealership visit. The tools required are simple, and the operation is safe and easy, without risking scratches to the key. For daily maintenance, it's recommended to check the battery level every six months to avoid the embarrassment of sudden power loss. After doing it once, I found it so convenient that I'll always handle it this way in the future. Since the key is a precision component, I made sure to wash my hands to prevent static electricity while working on it.
I've changed the BMW key battery a few times, and it's pretty straightforward. First, use a small screwdriver or nail clipper to gently pry open the side gap of the key, and the cover will pop off. Inside, you'll find a small round CR2032 coin battery. When removing it, pay attention to the positive side to ensure the new battery isn't inserted backward. After installing, test the remote buttons—if the car unlocks, you're good to go. Just make sure the cover clicks securely when closing. Any household tool will do; no need for expensive repairs. The whole process takes less than five minutes, quick and hassle-free without needing a professional. Buying batteries online is cheap and convenient, so stock up in advance. Be careful not to drop the battery during the process. Make sure you get the right battery type—common ones are widely available. Once you learn how, share the trick with friends; they'll find it useful. It's simple and saves trouble—don't worry about messing it up.
