Glossary · Connectivity
What is a power bank?
Also called portable charger, battery pack
A power bank is a portable battery that recharges your phone or other devices on the move, without a wall socket. For flights it must travel in your carry-on, never checked baggage, because airlines restrict lithium batteries in the hold.
Airlines also cap the size of battery you can bring, measured in watt-hours (Wh), and the limits change — check your airline's current rules if you carry a large power bank.
Related terms
Updated July 2, 2026
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