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What is the process for replacing the battery in a BMW key?

2 Answers

DeMila

07/24/25 2:17am

BMW key battery replacement process is: 1. First identify the battery model for your car key, which will be specified in the vehicle owner's manual, then select a new key battery according to the specified model; 2. Remove the hidden mechanical key from the remote; 3. Using the extracted mechanical key, insert it into the key slot and pry open the key casing; 4. After opening the key casing, you'll find the battery positioned deep inside - use a flat tool to slide along the side gaps and gently pry out the old battery; 5. When installing the new battery, ensure correct polarity (positive/negative terminals), then snap the back cover in place to complete the battery replacement. Finally, reinsert the mechanical key. Taking the 2021 BMW 5 Series as an example: The main exterior changes involve adjustments to the LED light clusters - the headlights have become slimmer, daytime running lights appear more angular than the current model, and the front bumper has been redesigned. The M Sport version features a more aggressive front fascia. The new BMW 5 Series introduces two plug-in hybrid variants (545e and 530e), along with the 48V electrical system-equipped 540i and high-performance M550i models.

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AshlynRose

08/10/25 9:54pm

Last time I changed the battery in my BMW key, it took some effort. When I opened the key, I found a small slot at the back—just gently pry it open with a thin screwdriver. Inside was a coin cell battery, model CR2032, very common. Remember to check the positive and negative sides before putting in the new battery; putting it in the wrong way won’t work. When closing it back up, align it properly and press firmly to snap it into place. The whole process takes about five minutes, but be careful not to damage the circuit. I’ve been driving a BMW for five years and change the battery every year because the remote locking distance starts to shorten—that’s the sign of a weak battery. Keeping a spare battery in the car is handy; if the battery dies, you can still manually unlock the doors—this trick is worth learning. Also, using a keychain protector helps prevent drops and extends battery life.

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