Syma Toys X12 - Manual (Page 8)

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BATTERY CHARGING
Battery charging
Take out the USB charging wire, connect one end to the quad copter, then insert
the USB port of the USB charging wire to the USB port of the computer (or the
USB port of the power adapter) to charge the battery.During the time of charging,
the red indicator of the USB will be OFF.
When it is fully charged, the red indicator will be ON.
Caution:
1.When using the computer for charging,
please remember to pull out the
charging line before shutting down
the computer.
2.Please pay attention to aim correctly
to the correct polarity when connecting
the USB wire with the battery.Please make
sure the polarityshould not be upside down.
Charging time: about 50 minutes ;Flying time: about 4 minutes
CAUTIONS WHEN CHARGING
1.When charging,please put this product on the dried or ventilated area and
keep it far away from heat source or explosive product.
2.When charging, please remove the batteries from the quad copter.All the
charging process should be under the guidance of the adult so as not to
cause accident.
3.When finish flying, please do not charge the battery which surface
temperature is still not cooled down.Otherwise it may cause swollen battery
or even cause fire disaster.
4.During the process of battery charging, falling down or striking by the outer
force should be avoided.Otherwise it may cause short-circuited within the
battery and thus may cause danger.
5.In order to make sure safety, please make sure that you need to use the
original USB charging wire that made from our factory. When the battery is
used for a long time or appears aging or swollen,please replace them timely.
6.When the batteries are fully charged, if you do not remove it from the charger
for a long time, the battery may discharge automatically, which may cause
battery exhaustion. When the battery voltage that the charger has tested is
lower than the rated voltage, the charger will re-charge the battery until it is
fully charged. Charging or discharging too often or repeated charging or
discharging may reduce the using life of the batteries.