1.Anything above 160 Wh is forbidden, below that and above 160Wh is limited to 2 per person with the approval of the operator. 2.All power bank are only in carry-on baggage. 3.Don't carry power bank with unclear identity and don't use power bank during the flight time. 4.You can arrive at the number of watt-hours your battery provides if you know how many milliamp hours and volts your battery provides: mAh/1000 x V = Wh