[davidrm]

4680 is a cylindrical cell format, the number you quoted refers to the cell itself, when packaged into a battery with busbars, cooling, etc., the gravimetric density on pack level for model 3 is around 125Wh/kg. the number listed by BYD is 150Wh/kg pack level density. the cells themselves are probably around 200-250, but they require less packaging effort due to the fact that the cell housing for prismatic cells already incorporates various mechanical and safety features.

i haven’t checked any of the numbers nor have i seen 3rd party analyses, but it definitely follows the trend: prismatics keep getting better and they might ultimately win the race once we get to solid state and thermal management “solves itself”