You guys have to stop believing everything you read or hear from the media. By now one would think you all would know better.
There is no battery fire warning EICAS message in the 787 or for that matter any Boeing airplane that I know of.
In addition, the flight deck is slightly over pressurized on both the 777 and 787 so as to keep smoke and fumes out. The flight deck does not use a recirculated air source for the same reason. It actually uses 100% fresh air at all times. If there are smoke and fumes present on the flight deck, most likely the source is there as well. The battery is a long ways back in the aft EE compartment, so smelling it on the flight deck is unlikely.
The Cabin Air Compressors (CAC) have been know to overheat. Just say'n!