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      04-12-2012, 01:38 PM   #3
jphughan
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Drives: '16 Cayman GT4
Join Date: Mar 2011
Location: Austin, TX

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The glovebox port doesn't stay powered when the car is off. As for the console port, it definitely stayed powered for a few minutes after I turned the car off and locked the door, judging by the charging indicator on my mobile hotspot. It might turn off after a longer period of time, but it remained active longer than I was willing to sit there and watch -- and like you I didn't want to just leave it there long-term and potentially drain my battery (or find it had shut off and then not know how long the cutoff is).
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'16 Cayman GT4 (delivery pics, comparison to E92 M3 write-up)

Gone but not forgotten:
'11.75 M3 E92 Le Mans | Black Nov w/ Alum | 6MT (owned 5/2011 - 11/2015)