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Originally Posted by deutsch100
On the E46, older 5 Series, etc., the battery charged everytime you used it. There was no battery to replace.
If you read the manual for the E70, it uses a regualr battery, like other car makers use for remote lock/unlock. I'm not 100% sure, but pretty sure the E70 key fob does not charge itself.
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I have! E70 with comfort access only has regular battery - without comfort access needs recharging in the car. Perhaps you have comfort access??