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      04-12-2012, 01:38 PM   #3
Brigadier General
jphughan's Avatar

Drives: '16 Cayman GT4
Join Date: Mar 2011
Location: Austin, TX

iTrader: (0)

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).
'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)