Ninebot ESX Error Code 19
"Battery Voltage detection is abnormal, Please check the Battery, Control Board and related connections"
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Often error 19 is caused by a battery that has sat for a while and run out of charge but then has had its BMS rebooted by plugging it back in with a charged battery.
It can be fixed by keeping the battery charging with an external/internal that is partially charged which will allow the charger to keep passing current to the batteries without shutting off.