Samsung Galaxy S II GT-I9100 User Manual page 15

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When the battery is fully charged (the battery icon is no
longer moving), unplug the travel adapter from the device
and then from the electrical socket.
Do not remove the battery before removing the travel
adapter. Doing this may cause damage to the device.
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.
About the battery charging icons
When you charge the battery while the device is off, the
following icons will show the current battery charging status:
Charging Fully charged
Assembling
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