It appears there are two Li batteries on the ac, one at the front in the forward EE bay, and the other in the rear with the APU....
Post #41
To be fair, the structural damage caused by the battery fire that did occur was quite limited. The NTSB talked about it being "confined to the area immediately near the APU battery rack (within about 20 inches) in the aft electronics bay".
Thats a bit of a worry. If the same happens to the Main (forward) Battery. One of the Common Core Resourse (CCR) Racks is within 20 inches.
CCR is the brain of the beast.