Hi, I had this issue with my "China Phone" :P haha

I followed this tutorial and it was VERY USEFULL!
http://www.youtube.com/watch?v=cvC67ZR6zfU

What you need is:
An (old) USB Cable (an usb cable that you don't use, because u need to cut it)

Put the RED wire on the + mark of the battery
and the BLACK on the - mark.

Put the USB in the PC, let it stay there for about 15 minutes.
DONE!

Watch the video for demonstration.
Good luck!