Pity the crew didn't do a windmill re-start......why didn't they try
For obvious reasons I could not quote in Pprune the whole accident report chapter and verse. Otherwise I could have mentioned the fact the report stated the crew did try for windmill relight as soon as the engines were literally drowned in water. However they were still in extremely heavy rain while stuck in the thunderstorm and the Boeing investigation made the point that it is a waste of time trying to windmill relight while still in the conditions that caused the dual flameout in the first place.
Then when the load on the battery took place as an APU start was attempted, the already defective battery gave up the ghost completely. Thus no electrical power and no sparks to get the engines going. In short the crew were up sh#t creek without a paddle.