There is a published picture [1] of one of the failed assemblies next to a normal assembly of the same type, sitting on a forklift pallet. It's easy to gauge the assemblies' physical size and count a minimum of 16 visible cells. Not visible in the photograph are bus bars or power connector.

I don't see a lot of paint discoloration, and a label of some kind is not charred or much discolored.

[1] http://phys.org/news/2013-01-overcharging-batteries-eyed-boe...