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Originally Posted by cRiPpLe_rOoStEr
I guess an eventual commercially-viable hybrid aircraft powerplant will be premiered in some military application, as most of them remain using electric starters unlike airliners which now feature air starters more often. But anyway, it's likely to be dependent on the development of solid-state batteries which might be more suitable to the wider range of atmospheric pressures and the faster changes on this parameter they would underwent on flight.
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Solid state but not the ever ellusive graphene battery?