Please find below details of the power supply mod for Ninebot 10 to allow to use Charge Doctor - great tool to keep Your battery healthy..
I have over 5500 km on my Kingsong KS16S, charging it every day to 92%, and once a week to 100% - I see no decrease in range, batteries are still OK. (percentage can vary on different wheels, what is important to stop the charging when current starts to drop to save the cells from slow final phase of charging)
Charge doctor also allow to charge with 2 chargers at once - so this solves the "fast charging" issue in very universal way as wheel can be