I understand there isn't a manual, just a quick how-to guide. Here's some basic use info from a review
http://www.the-digital-picture.com/reviews/canon-bg-e6-battery-grip-review.aspx
The Canon BG-E6 Battery Grip is designed specifically for the
Canon EOS 5D Mark II
as shown above with a
Canon EF 16-35mm f/2.8 L II USM Lens mounted.
To get the Canon BG-E6 Battery Grip into the position shown, the LP-E6 Battery is removed from the 5D II
and the battery door detaches.
The BG-E6 slides up into the battery compartment and locks into place via the tripod socket screw
seen on the BG-E6 just below the lens in the above image.
The BG-E6 provides its own tripod adapter threads - this functionality is not lost.
The Canon BG-E6 Battery Grip holds two
Canon LP-E6 Batteries
that deliver double the number of shots or video time from the 5D II.
Alternatively, use 6 AA batteries in the included Canon BGM-E6 Battery Magazine shown below.
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