1.Remove the four screws on the bottom plate.
2.Use a thin iron sheet or a hard plastic card to pry off thebottom plate.
3.The yellow part is the battery. Unplug it and keep it for a fewminutes.Plug it in and turn it on.
4.Short the battery socket two pins for more than 10 seconds.
5.After 2-3 minutes, plug in the battery and start up.