On Sat, 28 May 2011 15:38:14 -0500, Jim Yanik wrote:

Jeff Liebermann wrote in
:

On Thu, 26 May 2011 12:51:48 -0500, Puddin' Man
wrote:


The + side measures 3 ohms.

Ok. There may be a diode inside the base. Try reversing the leads on
the ohms-guesser and see if it acts like a diode.

Measures infinite ohms when reversed.

It's a diode, with no series resistor. That presents a problem.
Without some form of current limiting, the voltage of the xformer will
need to be VERY carefully controlled to keep from overcharging the
battery. I will swear there's a resistor or charge controller
somewhere in the system, but I can't tell where from here.

the internal impedance of the transformer itself may be the current
limiter. That's the way it was in a B&D VersaPack NiCd charger I have.



I'm 'fraid you'll have to elaborate on this last. And, what is "C" in
.1C?

Sorry. C is the current rating of the battery in ampere-hours. A
typical NiCd pack, full of AA cells will have a rating of about 750
ma-hr. NiMH would be around 1200 to 2200 ma-hr.

Just a FYI,I have some Everready NiMH AA cells rated at 2350 mAH(bought at
Wal-Mart),and saw some no-name 2800 mAH AA cells for sale on Ebay.

I see stuff like that as well. Though i am starting to wonder if it is
just printing higher and higher numbers for the capacity without any
difference in the cells themselves.