Comment by wat10000

It's still a major expense. Reducing costs is good.

Higher capacity and faster charging doesn't have to actually mean more capacity and faster charging. It can mean smaller and lighter for the same capacity and charging speed. If you have a technology with 10x the energy density, you can build a car that goes 3000 miles on a charge, or you can build a car that goes 300 miles on a charge and has a battery only 10% the size/weight. (In practice a even a bit less than that, since the reduced size/weight will reduce how much energy you use per mile.)