Fast charging, long life, low cost – pick two. Actually, there are a bunch of other variables (energy density, stability, discharge current, etc. etc.), so the

Fast charging, long life, low cost – pick two. Actually, there are a bunch of other variables (energy density, stability, discharge current, etc. etc.), so the probability of a technology that improves one significantly without negatively affecting at least one other is vanishingly small. Hence the number of overhyped battery technologies that get reported but never productised.