Lufthansa power bank rules: up to 2, 160Wh, no use on board

In checked bags

Not allowed in checked baggage

With approval

Over 100Wh up to 160Wh: airline transport approval required

How many

Up to 2 power banks per person

Using it on board

Do not charge devices from a power bank or charge the power bank itself on board (except approved medical devices)

Where to keep it

Do not stow in the overhead locker; keep it under the seat in front of you, in the seat pocket, or on your person

Packing

Insulate terminals, e.g. by taping over exposed terminals or placing each power bank in its own plastic bag

No. Do not charge devices from a power bank or charge the power bank itself on board (except approved medical devices).

In the airline's own words

• Power bank rules, airline by airline
• Power banks on Japanese flights