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The fuel would all boil off before this lighter got anywhere near hot enough to produce copper fumes.
What I've read of scotchguard, the old formulation people swore by for waterproofing. The newer "environmentally friendly" formulation, people seem more likely to swear at for the application.
American Flag Concealed gun compartment that hangs on wall
When I think of pouring molten metal into water, I think of a steam explosion.
Granted, some Lithium Ion cells are capable of high discharge rate. But to assume that random salvaged cells can deliver such performance is risky.
Cast a Celtic Bronze Sword (Beautiful, Authentic Leaf-Shaped Ewart Park)--Easier and cheaper than you think!
A word of warning: the LiPo batteries sold for RC vehicle use are made for high discharge rates, as high as 60C (discharge full capacity in 1/60 hour) for high performance RC aircraft. Laptop batteries are designed for a much slower discharge rate, typically 1C. Drawing excess current from the battery can damage it.
Hopefully Brett & Heather will end up better than some of the couples on that list.
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