To fully charge the HTC II, only use the provided battery charger to charge the device, otherwise, you may damage the batteries. Connect the charger to the HTC II. There is a small LED light on the charger's power supply that will change from Red to Green, then the battery is fully charged.
The LED on the power supply for the charger is Red when you initially plug it into the device and then into the A/C outlet
When the battery is fully charged, the LED light on the A/C power supply for the charger, will change to Green:
Note: if you plug the charger into the A/C outlet, before plugging the circular D/C end of the charger into the HTC II, you will also see a Green LED light on the Charger's power supply. Please do not become confused about this.
Always plug the charger into the HTC II device, prior to plugging it into the A/C outlet.