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For the record I've owned both a BMW and Porsche with that feature and always replaced the battery myself and never had the dealer reset the computer for a new battery. Also never had issues after, 3y on the BMW, 1y and counting on the porsche...
I asked the porsche tech once and the comment was that our modern 911s are mini hybrids. They don't run the alternator when not needed to save friction and gas, and kick it on when engine braking, stuff like that, to minimize losses.... He told me the lack of battery registration would not significantly hurt my battery life span - not that anyone's done a comparative study of anything !
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