No the batteries won't charge like they do in a BMW, I found that both our keys needed the batteries done when I got the car, and also the wives seemed to eat the battery, also it played up a lot to start with and the conclusion I came to was it was in her handbag getting squeezed to death by all the usual crap the fairer sex carries around with them.
That i think was flattening the key fob battery and maybe causing other issues but since I told her she makes sure its in a part of her bag without stuff pressing against it and its been fine since.
Try new batteries in the keys, also have heard about people saying that the key needs to be matched to the car sometimes by starting the car with the key in the barrel, if thats true or just old fish wives tales i couldn't say but its worth a try.
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