A lithium battery is not really a bomb. A small fuel package, maybe. The airplane-grade ones are Li-poly, in principle sealed plastic bags. They pack a fraction of energy of the same amount of gasoline, which is not too big. The mechanical damage from the other parts of the aircraft is more of a hazard, and that depends on its size; and the carbon fiber tubing usually employed for the higher-end quads shatters annoyingly easily, and the styrofoam for large wings is so soft it is not much of a problem. Comparable to a bird, I’d guess; I’d say less bad in the styrofoam case, even.
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