@FiiO I'm using the Q3 as a desktop DAC/amp with my PC. In order to save the battery life, I'm leaving the charge switch ON. Is this correct?
Dear friend,
*When the Q3 is not in the low-power state (the charge switch is turned to ON), the Q3 will be charged once connected to a USB device. But if the charge switch is turned to OFF, it will not be charged.
*When the Q3 is in the low-power shutdown state, it will be charged once connected to a USB device regardless of the charge switch setting until the battery is fully charged.
Notes:
1. When connecting to a mobile device, it is suggested to set the charge switch to OFF in order to save the power of the mobile phone.
2. iPhone and Sony WM-port devices will not charge the Q3 regardless of the charge switch setting.
3. When the charge switch is OFF, the Q3 will not only stop charging the battery, but also not consume the current on the USB device. (That is, when the Q3 is connected to a mobile phone for decoding, it will not consume the power of the phone.)
When connecting to the PC, charge switch on/off will not damage the battery.
When using as a DAC for computer, the device would not discharge and use the power supply from USB port. Meanwhile the computer will charge the device.
While the device is charging
Because the computer USB port has limited current capacity, the battery is given priority for part of the charging current while the rest powers the device directly. But if the current draw by the device is high, the battery participates in powering the device as well. Hence, both the battery and the USB port take part in powering the device while the device is charging.
2. After the battery is full
Because there is no need to charge the battery anymore, the USB port would power the device directly. The battery would neither be charged nor discharged.
In summary of the above, the powering scheme of the device ensures that the battery may be fully charged while at the same time guaranteeing proper function of the device. Finally, the battery will be at rest after it is fully charged, thus guaranteeing extended battery life.
Best regards