Looks great. Lucky for you on the X3 install that BMW kept the door like EVERY OTHER DOOR on a Bimmer, unlike the X5 where they decided you have to remove the door panel to do that same mod. I have the same deal ready to go for my X5 but don't like the idea of removing the door trim to get to it (I'll do it eventually). I also had the same thing done on my M3 (which was just as easy as the X3).

Don't worry about any batteries dying. If you're not going to drive the car for weeks at a time, then I would assume you're putting it in a garage...so leave the doors unlocked if you're that worried about the battery dying.

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