An Israeli company called Chakratec has developed a charging system for EVs that uses Flywheels to accelerate charging. The Chakratec Kinetic Power Booster consists of a heavy flywheel suspended in a vacuum within a heavy steel canister. A small electric motor spins up the flywheel to “charge” it. When the flywheel is released it spins rapidly enough to charge a pair of EVs to approximately 80%.
Chakratec claims their new system can be installed almost anywhere and will be especially useful in locations without a string electrical grid.
See the Chakratec website for more info.