When/why do you need the batteries anyway?  Only when the engines are stopped 
right?  i.e. emergency?    

Not to make light of the situation, but it would be ironic if the emergency 
battery system caused the plane to go down.      You really really really really

want this to be right... Otherwise you might be better to leave out the 
batteries entirely and make damn sure the engines never failed.
Sounds like they are right to ground them for this.
   

If you had several well separated smaller battery packs, at least you'd be 
assured that no single battery failure could cause a fire so big as to be 
unmanageable.   Might even
provide a way for them to literally fall out of the airplane if they got too 
hot.
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