Yeah I think a LiPo fire is a nice safe show!
In British cultural terms, LiPo is the bonfire and cylindrical cells are more the fireworks...
Was that a nano-phosphate cell? I guess the definition "safe" is "the nasty stuff mostly stays inside the robot"...
At the end of the day batteries are just chunks of poison that store a load of energy - the energy wants to get out and if it does so too quickly it will get very warm and distribute the poison over a wide area. Don't be too hard on batteries though, petrol tanks aren't that different.
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