Conditions
Spare batteries must be individually protected (in original retail packaging, or by otherwise insulating terminals e.g. by taping over exposed terminals or placing each battery in a separate plastic bag or protective pouch) to prevent short circuits.
Quantity limit
No more than two power banks total per person may be carried. Airlines may be more restrictive in the total battery and power bank quantities permitted for carriage - contact the airline in advance.
Can be carried-on
Can't be checked-in