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Old 06-23-2017, 10:28 AM   #19
dale@thecoys.net
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Join Date: Dec 2005
Location: Lee's Summit, MO, USA
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Quote:
Originally Posted by pcarlson79 View Post

I took it to the carpark to test with 4 bars and then with ZERO warning I lost ALL power and fell backwards and opened up my elbow.
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Now, being an electrical engineer I decided to NOT charge the battery and open it up. The Ninebot Elite does have 2 battery packs. Each battery is 15s2p with their own BMS onboard. I found that the BMS had tripped on both battery packs which left the system with 0v to try and balance me.
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So moral of the story is that it IS INDEED possible for the system to cut ALL power with no vibrating, stick shake or beeps, just BOOM no power.
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But anyway, the fact they have separate BMS inside the battery box that can be triggered without being controlled by the motherboard is a bad design.
Thank you for the comprehensive analysis. That information is extremely valuable. And, of course, may save others from painful experience.

Last edited by dale@thecoys.net; 06-23-2017 at 12:02 PM.. Reason: Add info
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