Your battery will not be installed or charged when you first unpack your device.
Install the battery by taking off the back cover and inserting the battery. To take off the back cover, gently push it in the middle and slide it off.
To charge, connect one end of the data cable to the charger port at the bottom of the device, and the other end to a power USB adaptor.
Then connect the USB adapter to a power outlet. Charge the device for 12 hours.