Samsung SGH-E335IBATMB - Manual (Page 12)

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Section 1
5. Press the battery down until it clicks into place. Make
sure that the battery is properly installed before
switching on the phone.
Charging a Battery
Your phone is powered by a rechargeable Li-ion battery. A
travel adapter comes with your phone for charging the
battery. Use only approved batteries and chargers. Ask
your local Samsung dealer for further details.
You can use the phone while the battery is charging, but
this causes the phone to charge more slowly.
Note: You must fully charge the battery before using your phone for the
first time. A discharged battery recharges fully in approximately
200 minutes.