How to Replace the Battery in an Old BMW Key?

1 Answers
GabrielleLynn
07/25/25 12:14pm
Method for replacing the battery in an old BMW key: 1. First, identify the battery model for your car key, which is usually specified in the vehicle's user manual, then select a new key battery according to the specified model; 2. Remove the hidden mechanical key from the remote by pressing the black switch; 3. Use the extracted mechanical key to insert into a gap and leverage it to lift the key casing; 4. Once the key casing is open, you will find the battery positioned deep inside. Gently pry out the old battery from the side gaps with a tool, then replace it with a new one. Taking the BMW 3 Series as an example, its body dimensions are 4829mm, 1827mm, and 2961mm, with a wheelbase of 2851mm.
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