How to Replace the Battery in a New BMW Key?
2 Answers
The method to replace the battery in a new BMW key is as follows: 1. Press the switch at the top of the key to remove the mechanical key; 2. Insert the mechanical key into the gap at the top to pry open the key casing; 3. Remove the old battery and replace it with a new one of the same model; 4. Reassemble the key casing and mechanical key. BMW models include the BMW 3 Series, BMW 5 Series, BMW X1, BMW X3, BMW X5, etc. Taking the 2021 BMW X3 as an example, it is a mid-size SUV with body dimensions of length 4717mm, width 1891mm, height 1689mm, a wheelbase of 2864mm, and a fuel tank capacity of 65 liters.
Last month, I just replaced the key battery for my BMW 5 Series, and the whole process was quite simple. First, confirm the key model—most BMWs use CR2032 batteries. Use a coin to gently pry open the shell from the slot on the side of the key. After hearing a click, slowly separate the back cover. Remember to be gentle, as the plastic clips can break easily. When removing the old battery, pay attention to the positive and negative polarity, and insert the new battery in the same orientation. After replacing it, I tested the key and found it wasn’t responsive—turns out the battery contacts were oxidized. Cleaning the metal contacts with an eraser restored normal function. The whole process took about 15 minutes, saving me over 300 yuan compared to going to the dealership. I recommend keeping two spare batteries at home, as buying them online is half the price of physical stores.
