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To charge this power bank 5V supply is needed through micro USB. It says FOR the power bank the charge current: ≤ 2200 mA.

What does that indicate for the power supply max current which charges this power bank? Does that mean one should use a 5V supply/adapter with Imax>2.2A or Imax<2.2A?

(Normally when we use a supply for a device we apply exact voltage with minimum current the device needs or more. For example a device with input sepcs 5V 2A would work fine with a supply rated for 5V 4A. But it wouldnt work for 5V 0.5A)

But in this case it is not that clear to me.

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The power bank should internally limit the charging current to a safe level, and automatically ramp the current down when approaching a fully charged state.

Therefore you can safely use a 5V 3A power supply.

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  • \$\begingroup\$ How about using 5V 500mA supply. Would that load the power supply a lot? \$\endgroup\$
    – floppy380
    Nov 18 '19 at 13:25
  • \$\begingroup\$ It’s har to tell without knowing more about its internal design. But my guess is that it should be designed to be plugged into a ‘standard’ USB 2.0 socket which is only required to deliver 500mA. \$\endgroup\$ Nov 18 '19 at 13:30

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