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Battery capacity vs. temperature vs. time



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Everyone,

I hope I don't get booted off the list for this slightly off topic post, but
I am wondering if anyone has charts showing battery capacity for various
types of cells (my primary interest are in LiIon and NiMH, as well as other
high-capacity low-weight cells - cost is not a primary concern) versus
temperature over time?

The reason I am asking is that I am looking into building a telemetry
solution that will, while being terrestrial, risk exposure to relatively
extreme temperatures. A maintained -30°C on the cold side and +40°C on the
hot don't seem at all farfetched, and we may very well be dealing with
tempeartures in excess of those, plus lack of air flow to cool the
electronics. Moreover, the devices will be in the wilderness for *no less*
than months at a time, without the chance of human intervention. So, the
effect of temperature on the battery capacity is of great importance. The
current drain will be low to minimal, probably on the order of a quarter to
half a milliampere or so on average, with peaks of a few mA at most.

Does anyone have such charts handy, or know where I could find them?

Thanks in advance.


Michael Kjörling

- -- 
Michael Kjörling :: michael@kjorling.com :: SMØYBY JO89  ^..^
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Also 95f1 074d 336d f8f0 f297  6a5b 2aa3 7bfd 8a70 e33e (old)
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