grosporina

True, Amperage is what makes the motor work, but Voltage is what allows that motor to pull amps. The more Voltage you have, the more amps it can pull at one time.

Amperage is current, Voltage is the pressure.
With lipos, we also refer to amperage as the "capacity" of the battery. Or how much current "juice"it can hold.

Example: a 7.4V 2000mah battery. LOTS of available "juice", but it can only send it out slowly.
Example: a 11.1V 480mah battery, Not much available "juice", but it can send it out fast.

Think of a battery like a pump. It can do two things.
Move an amount of fluid (amperage)
Apply a certain amount of pressure to the fluid(volts)

Ideally we want lots of "juice" and we also want to be able to allow the motor to pull it fast. Problem is weight goes up as we get both. So you have to find the best option for your application.