The lithium battery must be removed and carried in the aircraft cabin with the terminals protected against short circuit. The lithium battery must have a capacity of less than 100Wh.
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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.
On-board GuidelinesYou must be able to place your own carry-on baggage into the overhead locker without assistance. We ask that you please stow small personal items under the seat in front of you, keeping the overhead space free for 10kg/7kg carry-on bags.
Carry-On Allowance: 1 Bag + 1 Personal ItemMaximum Dimensions of Carry-on Luggage: 21.5 in x 15.5 in x 9.5 in / 55 cm x 40 cm x 24 cm. Maximum Weight of Carry-on Luggage: 22 lb/10 kg. Maximum Dimensions of Personal Item: 10 in x 13 in x 8 in / 25 cm x 33 cm x 20 cm.
Passengers on Aer Lingus flights are allowed to carry one small personal item, such as a handbag or laptop, with maximum dimensions of 25 x 33 x 20 cm free of charge. An additional carry on bag of 48x33x20cm and up to 10kg in weight can be purchased separately with Priority Boarding online (from €5.99).
The FAA goes into precise details about taking power banks on planes: any battery that you take on board should not exceed 100Wh. External chargers or power banks are also considered to be a battery, and should not surpass a capacity of 27000mAh, or in other words, 100Wh.
What If My Aer Lingus Carry-On Is Overweight/ Oversized? If your hand luggage is too heavy or too large, it must be checked into the hold at a charge of €35.
Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.