is it possible to use flywheel battery only on a city car?

[Scania]

flywheel battery charge need lesser time than normal battery, & it save more energy with lesser space. if it can easily to recharge in a city, is it possible to replace normal battery by flywheel on a city car like fortwo & iMiev?

[kilcoo316]

flywheel battery charge need lesser time than normal battery, & it save more energy with lesser space. if it can easily to recharge in a city, is it possible to replace normal battery by flywheel on a city car like fortwo & iMiev?

Doubtful...

would it store its energy for a week if the car wasn't used?

[Scania]

if you park in in garge, you can keep to charge it