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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 >equire some form of fuse/circuit breaker for rechargable battery packs).
I have seen rip-off merchandise with the UL label. They know how to copy
those letters on the label. Remember, they are trying to duplicate everything
to make it look legit.
Yes, the circuitry may cost very little until you multiply it by a million or so.
That's is why they don't include it and can sell them cheaper.
Of course, an original dell battery price is marked up by about 400 to 500%.
As far as single battery cells, there are no requirments for safety circuits to
be built in. Wouldn't be practical or possible when you have to put, lets say, 4
AA's in a small compartment of a piece of electronics.
Also, that wire that melted was actually your fuse, if nothing else was
damaged.
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