Another discussion that I have not seen anywhere and perhaps deserves its own thread is how to determine the rated discharge. There is no standard currently.
Is it one cycle without destroying the battery?
Is it 100 cycles without damaging the battery?
Is it temperature?
Is it one cycle that will provide 90% capacity, or 80% capacity.
Is it a number that is decided for marketing to make the products compare well to other products?
We have tested many batteries that claim 20C discharge that either selfdestruct under the load or are junk a few cycles later. Is that really a 20C battery? We have tested many batteries over the last year that claim 20C under a moderate 30amp load that are junk within a just a few cycles. That is less than 10C in most cases.
So what does this number really mean? Who is deciding the rating and how is it being determined?
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