I do not know the exact chemistry of the Lithium-ion battery reactions, but 
based on my inorganic chemistry experience, it would not surprise me if there 
is actually metallic lithium in the battery when it is fresh; the lithium gets 
ionized as the battery is used.  Metallic lithium is like metallic sodium and 
potassium: it ignites spontaneously in the presence of moisture (releasing 
flammable hydrogen gas in the process). Once started, it will also burn in air 
in 
the absence of moisture.  Lithium-based batteries do store a lot of energy, 
but it means they have an unfortunate failure mode. Still, they are awfully 
useful.
Rob
KC6ROC
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