A two-wheeled electric scooter principally powered by batteries which together provide more than 100 volts. The scooter carries an onboard recharging system to replenish the battery supply. Accordingly, the onboard recharging system is not called upon to provide the main power source for acceleration...http://www.google.com/patents/US6326765?utm_source=gb-gplus-sharePatent US6326765 - Electric scooter with on-board charging system
