Charging with a charging bank for a while is broken because the mobile power supply does not match the mobile phone. When charging the mobile phone, the mobile power supply must first sense the current of the mobile phone before it will charge normally. If the output voltage of the mobile power supply cannot reach the voltage required for the mobile phone to charge, the mobile phone will automatically protect the battery and disconnect the charge. At this time, the mobile power supply will not sense the current of the mobile phone, so the mobile power will automatically shut down