According to the guidelines of the IATA, the International Air Transport Association, it is allowed to take a power bank with a maximum of 27,000 mAh or 100W on the 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).
Yes.A power bank is allowed on flight but only in a passenger's hand baggage. It is strictly maintained that you do not carry a power bank in your check in baggage.
For example, flyers often wonder if a 20000mah power bank is allowed on flight. As 20000mah makes for less than 100 watt-hours, it can be carried in cabin luggage.
Maximum capacity: 100 Wh or 27000 mAh. Emirates — spare or extra batteries (including lithium and lithium-ion batteries) can only be carried in carry-on luggage. Items that mainly serve as an energy source (e.g. power banks), are considered spare batteries. There is a limit of 20 spare batteries per passenger.
Powerbanks restrictions are airline specific. Most allow only up to 10000mAh only in the carry-on luggage. You are not allowed to put them in your checked baggage. That being said, I have flown in and out of Singapore with power banks and had no issues either way.
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.
Here are the general rules you should follow if you don't have the opportunity to verify the guidelines before you fly. Power banks should be carried in carry-on luggage, not checked baggage. Power banks should have a capacity of no more than 100 watt-hours or 20000 milliamp hours.
Power banks cannot be check-in and must be carried in hand luggage. The battery limit is 100Wh, so it depends on the voltage of the power bank as well. Most power banks are 5V. A 10000mAh x 5V battery is 50Wh which is well within the limit.
The rules on a piece of paper handed over by the security stated that you can only carry on if it is clearly marked with value <20000mAH x 5V or < 100wH. For those between 20000mAH to 32000mAH (100wH - 160wH) you have to declare and check in. Actually the rating allowed is very high, most powerbanks are much lower!