Power banks with a capacity of more than 10,000 mAh are prohibited, some companies allow you to take up to 20,000 mAh. Large numbers are an exception. Hand luggage is the easiest way to take your power bank on a plane.
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Lithium-ion (rechargeable) batteries and portable batteries that contain lithium-ion can only be packed in carry-on baggage. They're limited to a rating of 100 watt hours (Wh) per battery. With airline approval, you can bring two larger spare batteries (up to 160 Wh).
However, power banks with a capacity between 100Wh and 160Wh may require the airline's approval beforehand. Power banks with a capacity of more than 160Wh are strictly prohibited by various airlines internationally. For example, flyers often wonder if a 20000mah power bank is allowed on flight.
The restrictions as per the Federal Aviation Administration are for lithium-ion batteries rated above “100 watt hours (Wh) per battery”. Anything above that limit is restricted. While that limit allows most power banks to be brought on flights, there are still consumer power banks that exceed that limit.
Most airlines allow passengers to bring power banks in their carry-on luggage, but not in checked baggage, due to the risk of fire caused by lithium-ion batteries. The capacity of the power bank is also typically limited to 100 watt-hours or 20,000mAh.
Quantity limits: None for most batteries — but batteries must be for use by the passenger. Batteries carried for further sale or distribution (vendor samples, etc.) are prohibited. There is a limit of two spare batteries per person for the larger lithium ion batteries described above (101–160 watt hours per battery).
Power banks are not allowed in checked luggage / cargo luggage. You can bring power banks up to 27,000 mAh on most passenger aircraft. Larger power banks may be allowed on some airlines in some parts of the world.