Zte D90 User Manual page 19

Your phone is powered by a rechargeable battery. The battery is not fully charged when you buy your phone but there may be enough power in the battery to turn the phone on. Note that a new battery's
full performance is achieved only after three complete charge and discharge circles. Charge the battery by following the procedure indicated below.
With the battery in position on the
phone connect the lead from the charger to
the bottom of the phone.
Connect the charger to a standard AC
wall socket.
If the battery is charging whilst the
phone is turned on, the battery indicator on
the status line will animate If the battery is
charging when the phone is off the screen
will display a charging animation that
indicates the phone is charging. If the
phone is not used for a long time or the
battery is completely flat it may take a few
minutes before this indicator appears.
When the battery is fully charged, a
full battery power level icon will be
displayed.
When charging, ensure the power
cable is kept clear of walkways and does
not cause a hazard.
4. Battery Information and Care:
Using unauthorized charger may cause danger and violate the authorization and warranty rules of the phone.
Please charge the battery in time when it no longer provides acceptable performance. Do not use any charger or battery which is damaged.
Notes：
1. Do not charge the battery when the back cover is removed.
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