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They only contain Lithium composites, that are highly reactive with oxigen (i.e. they combust spontaneously) and are fairly toxic. If your modified gas engine

• perl4ever 8y ago
  "If your modified gas engine seems to work, you are quite safe" I think you are overstating your case. I have seen cars on fire by the side of the road...although it is possible it started with an electrical fault. I believe that it's not that rare for a model of car I own to have a leak develop in the fuel lines and drip fuel onto a hot manifold and start a fire.
• userbinator 8y ago
  They only contain Lithium composites, that are highly reactive with oxigen (i.e. they combust spontaneously) You're making the classic mistake of assuming lithium-ion batteries contain metallic lithium --- it's called lithium-ion for a reason. Primary lithium cells, which are basically never used for EVs, do contain metallic lithium; but lion cells contain lithium salts and a dissolved solution of lithium ions in the electrolyte. The electrolyte is a flammable organic solvent, but not more so than petrol. Lion batteries catch fire because the massive energy they store is released when damaged, and that ignites the electrolyte.