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KingSong 14d won’t charge.


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Wheel hasn’t been ridden much.  Was last charged few months ago, ridden couple times a week for a few thousand feet each time (to get the Mail, long driveway and Mail box not right there).  Battery now at 64% per KingSong app.  Decided to charge, charger just stays green.  Wheel works perfect/normally.  charger has 67.4 volts between pins 1 and 3, wheel has 371 millivolts between pins 1 and 3, whether on or off.  
 

have never opened it, but guess I have to?  Any ideas, or diagnostic tips before I proceed?  Thx!

 

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On some wheels the internal cables going to charge port sever. Could be worth checking.

Question. The last time you managed to charge the wheel, did it charge to 100%? Try to remember. 

If the pack has dead cells it would have shown as difficulty charging fully. With dead cells bms' interrupt charging. 

I don't want to alarm you. It could be something simple as a broken charger. The voltage is good but is it capable of pushing any current?

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