This guy clearly knows nothing about drone battery safety. YOU NEVER CHECK A DRONE BATTERY ON A PLANE!!!! The reason is if there is a battery fire and its under the plane you cant put it out but if you have it in the overhead you can put it out before it burns the whole plane down. Also, you never drain a LIPO battery all the way down, that's the best way to trash a battery.
Here is a great explanation of what you are asking about by Cooke Optics.https://www.youtube.com/watch?v=EkBbOU8Cwhg
That 12 year old can really read a Wikipedia page.
Just seems dangerous.
While I think this is very very stupid of the FAA to ask this for remote controlled devices. Years ago my company Atmosphere Aerial thought this may happen and we have become FAA licensed pilots so we are ready for something like this. AtmosphereAerial.com