(1) You may place a charged battery (preferably fully charged) into the charging case. Then, use the included USB-C cable plugged into the OUT1 port on the case, or use your own USB-A charging cable plugged into the OUT2 port; the camera battery will then charge your device (such as a mobile phone, fill light, etc.) at a maximum power output of 15W. (2) To ensure stable power output, there must be at least two fully charged batteries inside the case. Using only a single battery may lead to issues such as overheating or intermittent power supply. If the output indicator light begins to flash, simply unplug and then replug the charging cable to restore normal operation. (3) When you are using the charging case to charge other devices and wish to check the remaining power level, you can briefly press the Power Display Button to view the battery status for each individual slot. Note: When the charging case is functioning as a power bank, the displayed power level may appear to be 1–2 bars lower than the actual remaining capacity. This occurs because the discharge process causes a slight drop in the battery's voltage, and since the charging case's indicator lights determine the power level based on voltage readings, there will be a discrepancy between the displayed level during discharge and the actual level.