Identify the remote
This applies to the F30 remote with a removable metal key and accessible rear battery cover described by BimmerTech. It uses a CR2450 cell. Confirm the marking on your actual remote and battery, especially if the key has been replaced. Do not cut open a sealed rechargeable key or substitute a thinner cell because its diameter appears similar.
Open and replace
Remove the metal key using its release. Use the designed opening point to release the rear cover gently. Photograph the cell orientation before removing it and compare it with the holder’s polarity marking. Fit the matching new battery without bending the contacts, then close the cover securely and refit the metal key. If the cover resists, inspect the seating instead of forcing it.
Test while access is secure
Keep a working means of entry available and test lock, unlock and normal starting near the car. A coin-cell change is not the same job as registering the vehicle’s main battery, and it is not a reason to buy a replacement key immediately. If the warning or poor range persists, check polarity, cell condition and the holder before arranging key diagnosis.
Handle the old cell safely
Keep both cells away from children and pets; swallowed button batteries require immediate emergency medical attention. Take the old cell to an appropriate battery collection point. Record the replacement date. If the case cannot close positively, do not leave a loose battery accessible inside a damaged remote.
Sources / references 2
- BimmerTech: F30 technology and remote key ↗Reviewed Oct 6, 2026
- BMW digital owner manual ↗Reviewed Oct 6, 2026
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