Radarspotting

Southwest Airlines Limiting Passengers To 1 Portable Charger Onboard To Reduce Fire Risk.

https://simpleflying.com/southwest-airlines-limiting-passengers-1-portable-charger-onboard-reduce-fire-risk/.

People will still do what they want. Will be hard to enforce unless airlines do a 100% bag search.
I've never given much thought about these power banks. I guess they can easily be damaged causing the cells to short out? I have a few for my portable ABS-B that are encased in plastic housing and another in a metal housing. When I do recharge any type battery I'm always present during the charge cycle just in case. I've had issues with battery packs for some on my amateur radio handhelds getting damaged during charging maybe cause I was using a quick charger.