I had the problem with my V8F, charging stopped at 81,4V - leaving the wheel connected to the charger for hours after the light turned green didn´t help. I measured the voltage of the charger: 81,4V. I opened up the charger and found a setpoint potetionmeter (covered with white goo) and adjusted the voltage back to 84v. Now everything seems to be fine again. Why does the output voltage changing over time? Anyone found the same behavior with an inmotion charger?