Power Bank In Carry On Or Checked Baggage. Power banks cannot be check-in and must be carried in hand luggage. Lithium metal batteries not installed in a device spares are only permitted as carry-on baggage.

A 10000mAh x 5V battery is 50Wh which is well within the limit. That is the opposite to many things which can only be carried in checked baggage. If you put them in your checked bags then the likelihood is that the bags will be opened and the power banks.
In the rare exemplify that they catch fire it is much easier to manage the ardor in the cabin than underneath the plane.
If the rated power is less than 100WH power banks can be carried without approval. Lithium metal batteries not installed in a device spares are only permitted as carry-on baggage. A definite NO for power banks in checked baggage. In the rare exemplify that they catch fire it is much easier to manage the ardor in the cabin than underneath the plane.
