Power banks on planes: what to know before you leave

Watt-hour capacity limits

Up to 100 watt-hours (Wh) transport is free for most airlines; between 100 and 160 Wh you need airline authorization, usually requested when booking or checking in; over 160 Wh the power bank is not allowed even in carry-on baggage. When the watt-hour value is not printed on the label, calculate it by multiplying milliamp-hours (mAh) by voltage and dividing by 1000.

Carry-on baggage only, never in checked luggage

The power bank, like any loose lithium battery, must always go in carry-on baggage: if overheating or a short circuit occurred in checked luggage, it would be undetectable and unmanageable during flight. The rule applies to power banks integrated into other accessories too, such as suitcases with built-in USB charging.

How many batteries and what X-rays check

Many airlines limit two units per passenger for power banks in the 100-160 Wh range, but the exact number varies by carrier and it's best to check on the airline's website before departing. A power bank with visibly damaged, swollen, or deformed casing can be confiscated at security, regardless of the declared capacity. Those needing to charge multiple devices once in the airport can refer to our guide to charging zones in terminals.

Before packing, check the watt-hour value printed on the power bank: if it's missing or illegible, it's better to leave it at home or replace it, because at security checks no one will be able to verify it for you.