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Alas, matey, this is a lesson I learned the hard way... twice. My crime was leaving the keys on the floor mat whilst I washed and waxed my 745i. The battery died, but it did come back to life with an overnight trickle charging, and it never coughed or hiccoughed after that, even after I did the same damed thing about a year later. Charged it overnight and it kept on ticking. Now that I have a 750, I asked the service dude if the new keyfob/battery combo would be susceptible to the same malady and he smiled at me and confirmed my worst fears! The joys of the ultimate driving machine...
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