I’d probably stay away until more feedback is provided. I bought an es4 in late november of 2018. Rose is maybe 500 miles and then in April I had the headlight / slowdown issue while heading home one night followed by the dreaded Error 18 which rendered the scooter useless.
If you google for ES4 control board issues you will find numerous similar reports.
Just received a note from the repair center that my scooter was not repairable and that Ninebot was sending me a new one.
Personally I would wait until someone with knowledge states what has been done from a design perspective to remedy what sounds like a poorly designed control board.
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