Quote:
Originally Posted by barryem
By the way the usual standard is 80% of it's original capacity. When it gets below that it's time to replace it and that's what's supposed to take 500 to 1000 charges. Of course when it gets to 80% capacity I've heard that it goes down from there fairly quickly.
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The curves for the various failure modes are mostly exponential, but in the other direction: initial reduction in capacity is quite fast and then the loss rate tails off as time goes by. The increase in internal resistance does not follow this pattern, but is more or less linear, but the rest -- plating, etc -- are mostly classical exponentials, IIRC.
(But this is an area of *very* active research and I am years out of date.)