Airlines ban power banks and spare lithium batteries in checked bags due to fire risks, allowing them only in carry-on with strict limits.

Airlines including Ryanair, easyJet, and TUI prohibit power banks and spare lithium batteries in checked luggage due to fire risks, allowing them only in carry-on bags with strict safety rules. Devices under 100Wh are permitted without approval; those between 100Wh and 160Wh require airline permission. Batteries must be protected from short circuits and not used to charge devices during take-off, landing, or taxi. Passengers may carry up to 15 personal electronic devices, with smart luggage requiring removable batteries. The UK Civil Aviation Authority warns lithium batteries can enter thermal runaway, causing fires, prompting these global safety measures.