The battery is partially charged when shipped. Before you turn on and start using your phone, it is recommended that you charge the battery.
Some batteries perform best after several full charge/discharge cycles.
As the battery is being charged, the notification LED shows a solid red light. The light turns to solid green when the phone is fully charged.
When you charge the battery while the phone is on, the charging battery icon is displayed in your phone’s status bar. After the battery has been fully charged, the charging battery icon turns to a full battery icon .
Note: As a safety precaution, the battery stops charging when it overheats.