This is a photo of one of the burnt up batteries from the NTSB investigation of the 787 batteries.
This is from the JAL 787 that caught fire on the apron at Logan International Airport in Boston.
You can read all about the National Transportation Safety Board’s investigation into the 787 battery issue on their website. They’ve got some relevant photos as well as interesting documentation.
They’ve even got a quick little primer on Li-ion battery technology.