electric scooter

The power necessary to power an electric vehicle depends on the sum of four forces (rolling resistance, aerodynamic drag, gravitational, and acceleration) multiplied by the velocity and the efficiency (1).
P = (V * E) (F_rr + F_D + F_g + F_a)
Electric motorcycles and scooters are vehicles with two or three wheels that use electric motors to attain locomotion. Electric motorcycles, as distinguished from scooters, do not have a step-through frame.
Increasingly accepted as capable, even appealing, forms of transportation, particularly in densely populated urban areas, electric two-wheel vehicles is a category that includes electric bicycles, electric kick scooters, electric motorcycles, and electric scooters. According to a 2010 report from Pike Research, worldwide sales of electric two-wheel vehicles (E2WV) are expected to increase at a compound annual growth rate (CAGR) of 9.4% through 2016.^[1]
Advantages of electric over gasoline power:

1. Nearly silent
2. Better acceleration characteristics than the conventional motorcycles in the same speed category
3. Some motorcycles have a removable lithium ion batteries that can be charged using any 120/230V outlet outside of the motorcycle
4. Environmental friendly (no exhausted gases at point of use)
5. Carbon tax and vehicle registration tax exemption in some countries
6. No parking/congestion charges in some countries
7. No road tax in some countries
8. Using grid power to charge batteries causes less pollution than gasoline scooters; (MIT wheel to well analysis of EVs) the amount of emissions and residues caused depends on the sources of the electricity used
9. No trips needed to a gas station—can be recharged at home or in charging stations. But charging or battery swapping in service stations, when needed, are faster
10. It can be used in a V2G system
11. Lower maintenance costs and fewer maintenance activities
12. Can be ridden indoors
13. More affordable than electric cars
14. Many models dispense with a transmission or the need to shift gears, simplifying operation
15. Instant on / no warm-up time
16. Much lower amount of heat given off by motor than is typical for some internal combustion motorcycle engines

Electric scooters (and an electric bicycle) parked in Chengdu, China

Disadvantages:

1. Up front costs may be higher than for a comparable gasoline powered motorcycle or scooter depending of the battery type used.^{[citation needed]}
2. Shorter range before recharging.
3. Longer "fill up" or recharge time.
4. Lower maximum speed at similar price points.
5. Electric power outlets are often not conveniently located near streets or driveways.
6. Battery capacity can be as low as 20% on a cold winter day with -20 °C. This disadvantage could be solved by using a lithium batteries which hold their capacity even in a cold weather.
7. As it is already difficult for motorcycles to be "noticed" by drivers of cars and trucks, the loss of characteristic engine noise might make riding these even moredangerous than their internal combustion engine powered counterparts.
8. The user has to take care of the batteries even when the motorcycle is not in use

fficiency
V = Velocity
P= Vehicle Power