Lithium will also catch on fire when exposed to moisture.
Which seems rather odd, when you think about it.
Saw a PBS explanation of lithium and scared the hell out me.
A car loaded with batteries would erupt into a fiery furnace if the batteries were compromised.
My flashlights are lithium powered and could be road flares under the right conditions
Scary stuff...
Still, love the power and longevity of the batteries in my flashlights...