I think you are misinformed on the trend of batteries. Most EV manufacturers have decided on the 18650 cell as the BEST for EV's which is what the Tesla uses. Flashlight battery? come on man, wake up and smell the coffee.
It's cheapest way to get the big amount of energy in small compartment
and it allows flexible pack designs. you just buy these small cells
and assemble them as you wish.
I have been expecting reports of various cell failures (not fires of
explosions, but reduced lifetime) from Tesla. But they seem to keep
lid on these kind of things.
The real kwh out versus $ is still unknown and this should be one of
the major issues to stare at.
Large format cells are cheaper to make in quantities. But we are not yet there.
Small 18650 cells are made in quantities and available from various
sources. The manufacturing equipment to build your own cells can be
bought cheaply. This is what car manufacturers wish to have. Something
they can control. Dog wish still remain to be the dog. Not the tail.