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That is the very thing I was exploring. The Lipo bags actually bring attention to the batteries. The airport TSA might think "this must be dangerous if he needs a Lipo bag." It might be better to down play it.
The Lipo bags do deprive the battery of oxygen, needed for a fire.
Yes, normally just have mine in their ziplock bags and in their separate compartments in my drone backpack, and never an issue.
True re oxygen and fire, but lipo runaway is different.
They first start to heat, then smoke, then get into the runaway stage, where oxygen might be needed after they spark out.
Possible that having them in ziplocks and a drone bag will do same thing.
If they are noticed in smoke stage (or heat stage if touch for some reason) then pouring water on them is vital to stop the next stage.
A catch 22 type scenario, maybe no answer except pray you don't see smoke coming from the overhead locker !!
I viewed an actual drone battery fire on YouTube some years ago, which was quite good, but couldn't find it just now (plenty of others not on aircraft there though with a search).
I did find this FAA one, which is REALLY good . . . only thing is Halon extinguishers are generally banned now, perhaps airlines or specialty uses they are still available.