SoftBank 921T Instruction Manual page 267

Settings for PC Connection
Use the USB Cable for Charging
•
Charging is not possible while the PC or the handset is turned off.
•
Charging may not be possible depending on the connection settings of the PC.
•
If the handset and PC are connected with the USB cable, either the PC battery or handset Battery is consumed depending on the Battery setting,
regardless of whether they are communicating data.
ON: PC battery is used.
OFF: Handset battery is used.
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Settings Connectivity
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USB Battery
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ON
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