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How to Replace the Battery in an Older BMW 5 Series Key?

1 Answers

CameronLynn

07/30/25 5:09am

The method for replacing the battery in an older BMW 5 Series key is as follows: 1. Prepare the key and the replacement battery. There is a clip on the back of the key; position it to the left. 2. Remove the mechanical key and gently open the key cover along the side. 3. Pry out the old battery, install the new one, and then reassemble the key by reversing the disassembly steps. After installation, test to ensure all functions are working properly. Precautions for replacing the battery in an older BMW 5 Series key include: (1) Avoid touching the circuit board or battery terminals. (2) Although the remote is waterproof, it should be dried immediately if it gets wet. (3) Ensure there is no dirt, grease, or foreign matter on the electrode contacts when replacing the battery. (4) After replacing the battery, check to confirm all functions of the smart key are working correctly.

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