How to Replace the Battery in an Older BMW Key?
3 Answers
First, identify the battery model for the car key, which is usually specified in the vehicle's user manual. Then, purchase a new key battery according to the specified model. Remove the hidden mechanical key from the remote by pressing the black button to release it. After opening the key casing, you will find the battery located deep inside. Use a tool to gently pry the old battery out from the sides. Once the old battery is removed, replace it with a new battery of the same model.
I always thought changing the battery for an older BMW key was pretty straightforward, almost like I've done it before, especially with those classic flip-style keys. First, use a small screwdriver or tool to locate the tiny groove on the side or back cover of the key, then gently pry it open—no need for brute force, or you might crack the plastic casing, which can be a hassle. The battery is usually a small, round one, like a CR2032. When removing it, remember the positive and negative orientation to avoid installing the new battery backward and rendering it useless. You can easily find replacement batteries at supermarkets or electronics stores for just a few bucks. After installing the new battery, test the remote lock/unlock function immediately to make sure it works. I reckon the key battery needs replacing every year or two on average. If the remote range shortens or becomes unresponsive, it’s likely due to low battery power weakening the signal. It’s smart to keep a spare battery in your car just in case of emergencies. Also, cleaning the battery contacts occasionally can help extend its lifespan.
When I first replaced the battery in my old BMW key fob, I made a small mistake but became proficient after learning. My key model is the basic non-button type with a small notch on the back cover. I carefully pried it open with nail clippers to reveal a CR2025 battery inside. The first time I replaced it, I installed the battery upside down, causing the remote to stop working. It took me quite a while to flip it over and get it working properly. Now, I always take a photo of the old battery's position before replacement to avoid repeating the mistake. Cheap batteries work just fine – you can easily find and order them on e-commerce sites. After replacement, it's best to test the functionality by pressing the buttons several times near the car to ensure quick response. Key fob battery depletion is quite common, especially during rainy or hot weather, so regular checks can save you a trip to the repair shop. The whole process takes just a few minutes, but requires attention to detail – otherwise, damaging the key would be more costly than it's worth.
