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'Detection of Alkaline batteries in a charger'
2005\08\15@133418 by Vasile Surducan

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On 8/15/05, Olin Lathrop <spam_OUTolin_piclistTakeThisOuTspamembedinc.com> wrote:
> alan smith wrote:
> > Anyone know of a method of detecting if a battery that is inserted into
> > a charger is alkaline or nicad/niMH?
>
> If it blows up and makes a mess after charging it was an alkaline.

Finally a good answer. Unfortunately a Li-I or LiP is making much
more mess when firing. Travel with planes with such things onboard
should be definitelly forbiden.

Vasile

2005\08\15@133837 by Vasile Surducan

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On 8/15/05, Wouter van Ooijen <.....wouterKILLspamspam@spam@voti.nl> wrote:
> > Anyone know of a method of detecting if a battery that is
> > inserted into a charger is alkaline or nicad/niMH?
>
> apply a square-wave load, observe the voltage difference, estimate
> source resistance? AFAIK the source resistance of NiCad is *much* lower
> than a compareable alkaline. But you might get introuble distinguishing
> a very small NiCad from a large alkaline.

 Apply a square wave when ? after a complete charge-discharge cicle
of the NiMh when it's fully charged, after 30 minutes with heavy load
on the battery, or when the battery is completely discharged? When it
have 60C or when have -10C ?
Source resistance of a good NiMh or NiCd is modifying with about 5-10
x between these situations. So everything is pure fantasy.

Vasile

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