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About Roger

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  1. I have just received my daughters ninebot Robot PTR where the battery fails to charge. Having read the previous posts thoroughly, I have opened the battery case and set to check the cells and the BMS. Firstly I charged up the pack directly avoiding the BMS and did this slowly, and it settled at 47.5V, by removing the white plastic plug on the BMS it is possible to monitor the increase in voltage from the first socket on the plastic plug using a pin and inserting this in the plug, and using a good voltmeter. I found the first pair to be 4.1 volts, and the voltage incremented as I went along, u
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