Sorry about the size of the picture guys.
You can't upload photos on this forum so it is a link to a high definition pic. I have now downloaded it, resized it and uploaded and linked to my Photobucket site.
I assume you guys are using a different browser to me. Mine resizes any photo to 'fit the box'.
The source is Boeing themselves.
The Boeing Company: Commercial Airplanes - 787 Electrical and Battery Systems Photos
My second thought was that visual inspection and maintenance of this unit is not going to be quick!