New one for me.

Announcement after boarding complete - but not during the safety briefing.

Power Banks are not to be stored in bags or used during the flight. Instead they must be stored in the back of the seat during flight.

When I asked was told there had been an incident with one recently in the overhead.

More than happy to unplug mine but do wish BA displayed and said the rules more prominently. I'm usually headphones on apart from the safety briefing and this announcement came out with it.