tomw wrote:
The presentation at the link below indicates capacity is relatively
unaffected down to 15C (59F) and also fairly independent of discharge rate
(pages 7, 8):
Yes; the amphour capacity of just about all types of batteries is not
affected by temperature. However, the amount of that capacity that you
can actually use is *strongly* affected by temperature. The internal
resistance goes up so much that you can't draw usable currents, and get
excessive voltage sag.
A crude analogy is a bottle of pancake syrup. It has the same amount in
it no matter what the temperature. But the colder it gets, the slower it
pours. If you get it cold enough, it freezes and you can't get any of it
out. But warm it back up, and it's all there, and all comes out again.
--
There are few industries with more BS than the battery industry.
Elon Musk
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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