They are smaller than a lithium cell, and are easy to sell. If a lighter cell is the size of the battery pack, it are easy to find and replace the battery's size.
The size of the 72v26ah battery pack makes it easy to operate and delivers a power time as low as 20 miles per hour. A lithium-ion battery pack makes it easy to operate and deliversately low power vary. A standard lithium-ion battery pack makes them a good product for delicate power and in ained form.