On Wed, 28 Sep 2005, P. J. Alling wrote:
Nope, no granularity at all, just Full, Half, Empty.. Sometimes Half goes
back to Full, depends on how
much juice you've just used.
I have measured the current that the -DS pulls during various
operations (AF, meter, bulb shutter, memory write, memory read, LCD
screen, internal flash charge, etc). Even stuff besides the flash charge
can take an appreciable current. Drawing a bunch out of the NiMH
batteries quickly will sagtheir voltage and cause the voltage reading
fluctuation.
The trouble with NiMH and a battery "fuel gauge" is that measuring
the SOC (state-of-charge) isn't that easy. NiMH have a very flat
discharge curve. They pretty much go-go-go-die with very little voltage
dropoff. *AND* the voltage at which that happens is a function of the
specific batteries (brand, age, load, temperature, etc).
-Cory
--
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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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