It makes no difference. The charging bank is 5V charged with 5V, the charger converts 220V AC into 5V DC and then charges to the mobile phone, but there is one more turn-down, and the final input to the mobile phone is the same.
The charging bay is for charging the Bluetooth headset. After using the Bluetooth headset, the user can directly connect the power supply to charge the headset.
On the other hand, due to the natural disadvantages of split Bluetooth headset battery life, the battery life is generally less than 4 hours, and the portable charging compartment can provide additional power supplement for the headset, thereby extending the battery life of the Bluetooth headset.
The difference is that the charging bin puts the device in to charge, and the charger is plugged in to charge