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Here is a portion of my notes on this, I believe I copy pasted one of the dev's responses on this topic.

If the card stays in the camera after shutdown, there shouldn't be any problems; but if you remove it while the camera is off, and put it back without turning it on, you may have surprises.

You should turn on camera after a card removal, because that's when it's locking up.

or To understand it better: when you open the card door and power switch is off, the camera wakes up for 2-3 seconds.

...AFTER TRANSFER OF RAW MOVIES (or any files) VIA CF CARD READER IT IS ADVISABLE TO TURN ON THE CAMERA AFTER ML CARD IS INSERTED THEN OFF BEFORE STOWING AWAY YOUR CAMERA.

Huge thanks for that bit of info!  Woke up to my 7D having a full charge for the 1st time in months!

Installed the most up-to-date nightly build on October 15th, 2013 and since then my battery on my 7D has been draining dead overnight....this has been insanely annoying but I'm just now getting around to finding out whats going on. 
any suggestions for which magic lantern version I should try for 'normal' battery life? 
Is there a way to only boot magic lantern from the update option when I want to use and not have it auto-boot everytime I use it?

Total ML noob, so I'd truly appreciate any suggestions.