Ninebot Max Motor Generations
Late in 2020/early 2021, Ninebot released a second version of the G30/Max motor.
Gen 1
The Gen 1 motor's SN (Serial Number) begins with a 5 or a 6.
It has better torque and hill performance, but on stock voltage, it will only go up to 20mph/30kmh.
The top speed also drops rapidly with the battery level.
Gen 2
The Gen 2 motor's SN (Serial Number) begins with a 9.
It is capable of faster speeds with worse torque/hill-climbing ability.
Some users have reported 22mph/35kmh+.
This battery is less prone to speed drop with battery usage.