Kenneth Chang

@MissionC2 @nytimes @kchangnyt Waste of time. Battery electric is the future.

@Robotbeat @MissionC2 @nytimes Batteries getting cheap but still not good enough unless people give up SUVs, minivans, pickup trucks.

@kchangnyt @MissionC2 @nytimes What's wrong with an electric SUV, minivan, or pickup?

@Robotbeat @MissionC2 @nytimes Too heavy, no range. Energy density of Li-ion is too low, can't scale to large vehicles. Physics, not $$

@kchangnyt @MissionC2 @nytimes I am a physicist, I know physics. If vehicles can burn gasoline or diesel, then they can be battery powered.

@Robotbeat @MissionC2 @nytimes Show me the math. How many 1000s of pounds of batteries, how efficient pushing that weight?

@kchangnyt @MissionC2 @nytimes about 2 miles per kWh, 300Whr/kg and 330kg of batteries is 200 mile range. Replaces heavy combustion engine.