I'm glad the above comment got some attention even buried here :) Another comment I'd like to make: Even with that increase, say 200 Wh/kg in 2010 to 240 in 202

I'm glad the above comment got some attention even buried here :) Another comment I'd like to make: Even with that increase, say 200 Wh/kg in 2010 to 240 in 2020, a lot of these higher-energy-density batteries are more expensive/easier to damage/have bigger heat management problems/etc. Keep in mind that is the raw cell weight. At 240 Wh/kg, you do not have any cooling, casing, wiring, BMS, safety systems - that is a plain cell in a vacuum. Once you've got all those goodies around the battery, even if you're best-in-class like Tesla your total energy density is around 150-160 Wh/kg. If you aren't making a luxury vehicle, you might end up around 80-90 Wh/kg (24kWh Nissan Leaf battery is in total 82 Wh/kg), and even if you do aim for something light and use fancy engineering you might end up around the 130 Wh/kg mark (2019 Audi e-Tron: 134 Wh/kg.) Batteries are hard.