Lithium/Iron Disulphide is quite safe, the cells have a PTC device built-in (protecting against short-circuit) and they don't generate any more dangerous chemicals once discharged.
The only real danger is if you puncture the cell (like with something sharp) then the fumes / fire are more toxic than alkaline.
They are prohibitively expensive, Duracell M3 ultra performs almost as well until you are talking sub-zero temperatures or really high currents.
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