I happened across this nice simple PWM circuit, and eventually ran across this excellent little tesla coil. The build information is pretty interesting. Between the capacitor brick and the car ...

Even with lithium, battery packs for ebikes can ... this would rely on a vast infrastructure of Tesla coils since that’s how this bike receives the power it needs to run its electric motor.

The world's largest lithium ion battery has begun dispensing power into an electricity grid in South Australia. The 100-megawatt battery, built by Tesla, was officially activated on Friday.