Leafmotor

I have a question about hub motor system.
Q:When I connected the last hub motor kit bought from ebay this happen:
On with key wit my 48v lithium battery – all 3 light comes on in throttle.
I twist the throttle slowly hub motor start to spin and I twist the throttle more (under half speed of full speed – the wheel is spinning free no resistance – Battery is fully charged. And suddenly hub motor stops and the light on the throttle goes off.
If I take off the power with key and on again then the light comes back on the throttle.
I also try a another throttle with no difference.
How could this problem be solved ?
A:I think the problem is from your battery.Some cells inside your lithium battery are broken.Though you full charged your battery,it also can drive hub motor system when output less current(less than half speed).If twist more,need to output larger current,some broken cells will be used out energy earlier than good cells.At this time,in order to protect all cells,your BMS inside lithium battery will stop output.Therefore hub motor stopped.
When you re-start,hub motor kit still can work at less speed.

Do you have volt-meter,you can test your hub motor system as below:
1.Make your hub motor wheel in the air;
2.Power on and measure the voltage from positive and cathode of your battery;
3.Read data,maybe 42V(full charged 36V battery);
4.Twist less,run slowly;
5.Read data,maybe 41V,no any problem,three led on throttle still work;
6.Twist more,hub motor stopped;
You will find the voltage dropped less than 34V when you twist more and hub motor stopped.
But when your loose throttle,the voltage will be back 42V.So when you turn on your key,three leds be on and hub motor works.

In order to make your hub motor works normal.You should replace cells.