"no evidence of a direct causal relationship"
I fully understand that this needs to be investigated thoroughly and this will take time, but this carefully loose phrase does not reassure me about the entire battery and electrical system.
Add to this the fact that Boeing seems to have declined strong advice to insulate the roof structure, and that the Manchester 787 had electrical faults relating to toilets and galleys all leaves me very uneasy.
The Dreamliner reminds me of the British Advanced Passenger Train, in which every single component was new, radical and unproven. The project ended up seriously behind schedule, massively over-budget, and was then pressed into trial service too soon. It was technically superb, but unreliable and a failure. For the time being this is one Boeing in which I am NOT going.