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      04-10-2010, 01:07 AM   #5

Drives: 2015 i3, 2015 M3
Join Date: Jul 2007
Location: San Diego, California, USA

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2015 BMW M3  [0.00]
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The CR2032 battery alone is about double the thickness of a credit card. And that's before the circuit board which is probably a little thicker than the battery. The final project will still be a bit larger than a credit card, but you might be able to make it smaller than it is now. Assuming you have a way to cover the battery and are willing to give up the buttons to lock/unlock the doors. You'd have to crack open the plastic key case with a little Dremel tool or something, hack apart the current circuit board to remove the buttons, and mount the whole thing in something smaller. I certainly wouldn't be brave enough to try it.