a vidio has been made to show how to open the back cover of Quad and how to install the battery:
flickr.com/photos/seeedstudi … hotostream
This video could be improved by spending more time on the Quad orientation and which way to slide the cover to remove the cover. In the current presentation the Quad orientation is minimal and you must watch the end to get a good orientation and then reverse the cover install procedures to get the cover off.
Just my two-cents. 
yes, we have little experance in this, thanks for your professional suggestion.