Just FYI, LiPo batteries aren't lithium-metal, they are lithium-ion. They have different failure mechanisms. The fire in a LiPo is cause by the electrolyte bei

Just FYI, LiPo batteries aren't lithium-metal, they are lithium-ion. They have different failure mechanisms. The fire in a LiPo is cause by the electrolyte being too hot due to an internal short-circuit and thus igniting, not because lithium is reacting with water as a lithium-metal battery does. LiPo is thus safer than lithium-metal, since a leak to the environment doesn't necessarily result in a fire. Even safer are LiFePO4, which are as safe as NiMh, although their energy density is slightly lower than LiPo. Lithium-metal is mostly used for coin cells, eg for watches.