How to Replace the Battery in a BMW Car Key?
2 Answers
To replace the battery in a BMW car key, follow these steps: 1. Prepare a battery of the same model as the car key and remove the hidden mechanical key from the remote; 2. Insert the mechanical key into the key slot to pry open the key cover, revealing the battery; 3. Remove the old battery and replace it with a new one. Taking the 2021 BMW X1 as an example, it is a compact SUV with dimensions of 4565mm in length, 1821mm in width, 1620mm in height, and a wheelbase of 2780mm. The 2021 BMW X1 features a MacPherson strut front suspension and a multi-link independent rear suspension. It is equipped with a 1.5T turbocharged engine, delivering a maximum horsepower of 140PS, a maximum torque of 220Nm, and a maximum power of 103kW, paired with a 7-speed dual-clutch transmission.
When I previously replaced the battery in my BMW key fob, I found it quite simple and had no issues doing it myself. First, I noticed the key was out of power, so I bought a CR2032 battery, which is the common type used by BMW and can usually be found at convenience stores. Then, I used a coin or small screwdriver to pry open the back cover of the key fob. BMW key fobs typically have a small gap—just gently pry it open without using too much force to avoid cracking the cover. After opening it, remove the old battery, paying attention to the positive and negative terminals to ensure they aren’t reversed. Insert the new battery in the same orientation. Finally, snap the cover back on and press firmly until you hear a click. After replacing it, test the buttons to see if they unlock properly. If they don’t work, the battery might not be seated correctly, so you may need to repeat the process. The whole procedure takes just a few minutes and saves a lot of money compared to going to the dealership.
