Question is tho, if the battery does die and you can swap out the battery does that key need to be reprogrammed again before it's useful? If so then this may not be a good option to have as a hidden key either. Just the basic vallet key is still the only sure way

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S