Samsung GT-I9305 Quick Start Manual page 13

2. Plug the large end of the travel adapter into an
electrical socket.
If the device receives an unstable power
supply while charging, the touch screen may
not function. If this happens, unplug the travel
adapter from the device.
3. When the battery is fully charged, first unplug
the travel adapter from the device, and then
from the electrical socket.
Do not remove the battery while the device is
connected to the travel adapter. Doing so may
damage the device.
12
To save energy, unplug the travel adapter
when not in use. The travel adapter does not
have a power switch, so you must unplug the
travel adapter from the electrical socket when
not in use to avoid wasting power. The device
should remain close to the electrical socket
while charging.