[GJim]

Mate, are you joking?

Do you seriously think a fag lighter with a self extinguishing flame is more dangerous than a burning lithium battery.

Seriously?

[paulryanrogers]

I seriously think that the kinds of batteries (intentionally) allowed on planes are designed to avoid bursting into flame. Even if such batteries store more potential energy than common pocket lighters.

I.e. a lighter is likely more dangerous in practice.