I use my MBP in clamshell mode most of the time, via a Thunderbolt dock.

But from time to time, it's good to let it run from battery power. However if I unplug the power adapter, I cannot enter clamshell mode unless I open the lid.

Is there any way to enable clamshell mode WITHOUT using power adapter?

  • If you're connecting the macbook to an external display, why would you not plug in the power cable? – Joonas Jan 21 '16 at 9:08
  • I do, most of the time, but it's bad for the battery to be always plugged in. I would like to run off battery for a few hours every few days. – Dan Jan 21 '16 at 13:36

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