Types of Small Electric Vehicles include:

- Electric Two-Wheelers like electric motorcycles, scooters, and mopeds.

- Electric Bicycles (E-bikes) which are traditional bikes with a battery and motor.

- Electric Three-Wheelers used for transporting goods and passengers.

- Electric Boat Outboards for small crafts or trolling motors in larger vessels.

Battery Aspects to consider are:

- Battery Swapping which allows quick exchange of batteries.

- Battery Safety concerns with lithium-ion batteries related to overheating and fire risks.

- Cycle Life which is the number of charge and discharge cycles before battery degradation.

Practical Adoption trends show:

- Urban Mobility preferences leaning towards electric scooters and e-bikes for short commutes.

- A rise in Electric scooter-sharing platforms in cities globally.

- Cost Savings from fewer maintenance requirements and lower energy costs.

- The Environmental Impact from reduced emissions leading to cleaner air.

- Governmental Regulations and Incentives promoting electric vehicle adoption.

Challenges faced include:

- Developing Infrastructure for battery swapping.

- Varied Public Perception about electric vehicle longevity, safety, and efficiency.

- The initial higher Battery Costs primarily due to the battery.

In summary, small electric vehicles are becoming more popular due to their environmental and economic benefits, with the potential to reshape urban transportation.