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if you are talking about the latest key with a mechanical key part on it, with the three buttons with the roundel in the middle for the lock button then, yes!! the dealer is correct, the way it works it there is a capacitor in the key and that is what powers the buttons for locking and unlocking, when you insert the key into the ignition there is a plastic ring peace that goes around where your key goes into your igntion, that is called the antenna ring, it read your ews code ( anti theft code that allows you to start the car) and also charges up the capactor via magnetic wave in your key, as long as the key is in the ignition and turned to position 2 it will be charging, so either put your key in and turn it on WITH A BATTERY CHARGER HOOKED UP TO YOUR CAR or drive it, however it does take a couple hours for the key to be fully recharged. good luck.

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Q: Your BMW key does not keep a charge since you do not drive it much dealer says only fix is to drive car more often anyone know how to charge it some other way than in the ignition when car is running?
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