3.
The display will show the battery icon with charge level as a
percentage.
4.
If the device is powered by an external power supply, but the APS3
battery is not connected, only the built-in battery will be charged.
5.
When the external power supply is disconnected, the device switches
to the internal battery pack without powering off.
Warning!Charging the built-in battery and the APS3 battery from the
power bank at an external temperature below 0 °C (32 °F) can reduce the
battery life. When using external power, connect the Power Bank to the
device after it has been turned on and working for several minutes.