Re: NiCd vs. NiMh

tnom@xxxxxxxxx wrote:
On Sat, 11 Jul 2009 14:09:20 -0400, E Z Peaces <cash@xxxxxxxxxxxxxxx>
wrote:

tnom@xxxxxxxxx wrote:
How did you get a plain dumb charger to cut back that far?
It's called electrical theory. Even the dumbest of dumb chargers have
to abide by it.
The dumbest of dumb chargers use rectified sine waves. Without a voltage regulator, the state of charge will have little effect on current.
Really? The state of charge has a direct effect on the output of the
charger. Just what world do you live in?
You're talking about capacitors. If you charged a capacitor with a regulated 1.4V, the current would taper toward nothing at 1.4. With an unregulated charger, current would taper toward nothing at about 2V.

Chemical batteries are different. Voltage-regulated chargers have been used for lead-acid batteries but never worked for nickel batteries. Terminal voltage on NiMH drops when it's fully charged, which means a voltage-regulated or unregulated charger would speed up.

I can't believe how ignorant one can be. Regulated or not, battery or not, when for example a source puts out one volt and a load holds a 1 volt charge just what kind of current will flow from a 1000 amp
source?

A load doesn't hold a charge. The only thing I know that can be said to be charged to 1 volt is a capacitor. If your batteries are marked in microfarads, they must be capacitors.

Are you saying that I was lying about the 340 micro amp trickle
charge?

I've seen it, but only with voltage-regulated chargers. I quit trying to charge nickel batteries that way long ago. On a charger, a battery that you know isn't fully charged may show the same voltage you expect of a charged one, and trickle charging shortens the service life of a nickel battery.
.

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