Charging them on aircraft is encouraged - no?
Every business class or first class seat I have ever flown in has had a power port so yes you can charge any of them once your reach 10000 feet and have access to the overhead bins. The plugs are on from engine start up I routinely plug my phone and tablet in then drop them in the seat pocket for take off. The higher end seats have 120v 60hz plugs not just USB ports. Properly regulated Li-ion cells don’t just blow up. You have to over charge or over volt them.