How to Replace the Battery in an Older BMW Key?
2 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.
