Charging the PCC-
When you plug the A/C charger into the PCC, the PCC is fully charged when the light turns green on the A/C adapter.
Charging the battery in the PCC-
When charging the battery in the PCC, you first need to screw the battery in the front slot about 3 turns. When the battery is charging, the light on the side of the PCC will be solid red, and when the battery is fully charged the light will blink, and then turn off after 1/2hr. You will want to unscrew the battery at this point.
When you are on the go make sure to unscrew the battery when the light turns off, it can drain the power charge in the PCC/battery if you leave the battery charged the whole time.