The unit's backup battery is a sealed rechargeable like the Philips Nino 300 series. I'm not sure I like this idea. But, I can live with it. Simply touching the point on the screen did not work. I had to move the stylus in a way similar to coloring in an area with a pencil.
Stylus calibration is extremely difficult and frustrating.
The problem might be due to the fact that I tried to calibrate it while the battery was charging. I will try to recalibrate after the battery is charged. I am forced to use the virtual keyboard for input. The docking station seems to be more transportable than the Casio or Philips docking stations. The docking station folds into a compact flat case.