Personal fans that run all day. Tiles that keep working for decades. Traffic lights that can be deployed by police wherever they're needed. E-Bicycles that can outrun and out-range most bus routes. Electric airplanes make air travel significantly quieter and much cheaper. Internal combustion engines made obsolete and reduced to a historical curiosity. Electric scooters dominate worldwide as honda cubs become too expensive to fuel. I want it all.

Ebikes can already outrange most bus routes. I'm building a battery pack right now that should give a range of 150-180kms realistically, for about 300$CAD. That said, it's going to be pretty heavy at 10kg, but that's less than the amount of textbooks I was carrying just a few years ago :)

That sounds interesting. How big will it be physically?

About 5-6 liters, should fit nicely on the rear rack.

That is very cool. What cells are you using?

Cheap LG LGABB41865. They are low discharge, but since I have 2kWh of capacity I'm not going to be going north of 1C so it is well within spec.

Indeed, this high Specific Energy (~2000 Wh/kg) would be enough to make electric airplanes feasible and economical.

Heck, even high-altitude supersonic electric "jets", because you don't need oxygen to run electric motors!

Industry is where something like this would really be useful. Imagine how much job sites would change if we could achieve this type of energy density in a battery.