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Just thought I would throw this little tid-bit out there.
This past week I was watching the news about cheap 3rd party cellphone
batteries.
Apparently these manufacturers are selling them cheap because they do not
include the electronics to shut the battery down if it is shorted or overheats.
It showed a woman, whose hands were bandaged due to burns, from using
one of these batteries in her cellphone. The device got hot and exploded.
So, for those skeptics out there, this is for real.
Yeah, the batteries work find, but if they ever experience an internal short or
external short, well, can you say "melt down"? This can apply to the cheap
no-name axim batteries we are seeing on the market.
You can be carrying a spare battery in your pocket with change and this
could short out the battery. Can you say "OUCH"?
They mentioned that there are not only 3rd party batteries, but rip-offs of
what appears to be original manufacturers batteries.
So, my point is "BUYER BEWARE".
Is it really worth it?
This tip brought to you by......B0SC0
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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Originally Posted by A friend of mine who has a Linux kernel named after his girlfriend.
If I was VirtualBox, I could load my virtualization module into Hannah and boot up another kernel in the same address space.
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).
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!
>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
I guess what Dell needs to do is install an encrypted EEPROM chip in every battery, so it will be very hard to duplicate. (authorized 3rd party vendors can license the chips)
Of course, if the real point is to improve battery life, it should be possible to buy a car charger for the Axim and wire it to a battery pack taken from a cheap UPS. (the last one I checked was 7Ah at 12v!!!)
Quote:
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.
Well, just about any good sized battery can explode under short circuit conditions. I have seen a AAA battery explode in a flashlight because the wrapper was nicked allowing a short circuit to the flashlight casing.
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Originally Posted by A friend of mine who has a Linux kernel named after his girlfriend.
If I was VirtualBox, I could load my virtualization module into Hannah and boot up another kernel in the same address space.
^^^^^ That's true. I've had AA/AAA/C/D batteries explode in all sorts of conditions and for, seemingly, no apparent reason. I'm not talking about those bootleg ones either. I'm talking Durecell, Eveready, Kodak, etc.
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^^^^^ That's true. I've had AA/AAA/C/D batteries explode in all sorts of conditions and for, seemingly, no apparent reason. I'm not talking about those bootleg ones either. I'm talking Durecell, Eveready, Kodak, etc.
Explode like "Bang!" or explode like "leak all over the place" ?
I saw a tractor battery explode (bang like a gunshot) right in front of my uncle about a month ago. He was ok, but who knew that you need to keep water in those suckers? I guess I've just become too accustomed to things working the way they're supposed to.
You do need to be careful.
Go out and check right now that there is water in your car battery. Might save you some hassle later on.
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