Hi guys,
I'm not familiar with the Sony R37 so dunno how it's battery gauge is
calibrated but the gauge on the R3 seems to work well with both alkalines
and nicad or nimh rechargeables. Whilst I haven't actually monitored the
exact voltage range associated with each of the four battery levels, I guess
the internal resistance of alkalines makes them behave rather similar
to rechargeables in it.
A current drain of say 300mA is gonna cause a voltage drop from a set
of alkaline cells so their 1.5V nominal voltage may become 1.3V under
load. The same drain from Nicads will have negligible effect on their
voltage due to their very low internal-resistance. I guess the same will
apply to NiMH cells but I am not certain.
Nicads will certainly hold a fairly constant voltage for most of their life but
it does fall slowly and probably in a similar range to the voltage presented
by alkalines (when under load). I can also say my R3's battery indicator
works fine with a couple of 1300mAh NiMH AA cells though as it was
designed to take either Alkalines, or the BP-DM20 NiMH pak I wonder
if perhaps it auto-detects rechargeables (inc Nicad) and adjusts the
gauge accordingly.
I have a number of things that say "don't use rechargeable batteries" in
the booklet. I can honestly say I have never used my nicads in any of the
manuals, but have never had any problems using them in the gadgets
in question :-)
The only thing I would say you shouldn't use rechargeable batteries in are
electronic kits, where you wire up a circuit yourself. Nicads have a *very*
low internal resistance and if you accidently wire up a short circuit, things
will go seriously pants when you apply the power :-P
Cheers,
PrinceGaz -- "if it harms none, do what you will"
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