What I find amazing is just how such a simple concept and implementation can be so messed up (787 wise), hell, we are taking a piss-ant capacity battery(s) ie. some 75AH @ 32V each compared to a Tesla car battery that's some 230Ah @ 400V, they also experience a far higher charge/discharge rate (supercharger use and 'ludicrous' mode), yet they manage not to catch fire or need to be in a stainless steel box, they also work out lighter per KWh stored.
Nothing wrong with using Lithium-ion, just like everything else, design it right in the first place.