It was fault, couldn't be used, couldn't be charged.
I opened the case, and found the problem.
It happened because the electric from battery didn't go to the circuit.
I looked for the reason, and found there was a broken component, it is like the fuse, or electric limiter.
The solution is: I take a small wire as new component and soldered it to change the function of broken component.
See the figure :
First I opened the case, remove all the Batteries, and take out the Board (PCB)
The broken component is showed in the red circle , click on the picture to enlarge. Its function is to limit the electric current.
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