starman wrote in message ...
Mark Keith wrote:

The nickle
hydrides are slightly different. The charge voltages are about the
same, but when they are fully charged, the voltage peaks, but then
slightly drops off a bit. This indicates full charge. This is why they
have separate chargers, or switchable ones that do both types for
nicads vs nickle hydride.

The nickel cadmium (NiCd) battery is the kind that reaches a peak
voltage and drops off a little when it's fully charged. The NiMh don't
do this.

Sure they do. http://data.energizer.com/batteryinf...al_hydride.htm
But I do notice they seem to indicate temp monitoring is preferred to
voltage for overcharge cutoff. But for the average user, voltage is
probably easier to measure. MK

Mark Keith wrote:

starman wrote in message ...
Mark Keith wrote:

The nickle
hydrides are slightly different. The charge voltages are about the
same, but when they are fully charged, the voltage peaks, but then
slightly drops off a bit. This indicates full charge. This is why they
have separate chargers, or switchable ones that do both types for
nicads vs nickle hydride.

The nickel cadmium (NiCd) battery is the kind that reaches a peak
voltage and drops off a little when it's fully charged. The NiMh don't
do this.

Sure they do. http://data.energizer.com/batteryinf...al_hydride.htm
But I do notice they seem to indicate temp monitoring is preferred to
voltage for overcharge cutoff. But for the average user, voltage is
probably easier to measure. MK

The smart chargers I have monitor the voltage rise and dip of a NiCd to
terminate the fast charging rate, then it goes to trickle charge. With
the NiMh it tappers to a trickle charge when it senses peak voltage.
There is no temperature monitor for either kind of battery.


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starman wrote in message ...


The smart chargers I have monitor the voltage rise and dip of a NiCd to
terminate the fast charging rate, then it goes to trickle charge. With
the NiMh it tappers to a trickle charge when it senses peak voltage.
There is no temperature monitor for either kind of battery.

You sure you don't have that backwards? It should be the other way
around. Or most are anyway. I've used and charged both varieties using
homebrew chargers. I only used the voltage dip method for NiMh. There
may also be a small dip on the nicads, but I never really noticed it
that much. All the nicads I had usually peaked voltage, and hung there
until the charger was disconnected. Most commercial chargers are
opposite from how you describe yours. Or the ones I've seen anyway...
MK