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Originally Posted by star882
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Then what about those plain old cylinder batteries? Last time I checked, ordinary cylinder batteries (even the high power rechargeables) have no protection circuits. Which means very dramatic results when I accidentally short circuited a homemade circuit (a wire melted, and that's from 4 AAA NiCds).
I suppose that the cost of a thermal fuse (even a PTC self-resetting) can't be that expensive, can it?
One thing's for sure, if the battery has a UL listed mark, it's safe (UL labs require some form of fuse/circuit breaker for rechargable battery packs).
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Li-ion batteries have different chemistry than ni-cad or alkaline ones. A short circuit can cause them to explode, which is why they need internal circuitry to make them safe.
As far as the UL mark: the battery itself is bogus... these people have no qualms about printing UL-approved on the outside of it!