Chris Harper wrote in a message to Ian Woofenden:
 CH> On 01 Dec 96 at 15:53, Ian Woofenden of 1:101/525.3
 CH> wrote to Chris Harper about :
 IW> I took a 220 AH battery and took the numbers of cycles from the
 IW> curve at 5% discharge, 20%, 60% and 80%.
 CH> Hmmm... I am sure that different battery makers would have 
 CH> similar but not the same curves for the same battery types, and 
 CH> that different types would have totally different curves all 
 CH> together. 
Probably,  due to varations in the designs.
 CH> And I would bet that the battery makers aren't to forthcoming 
 CH> with the information needed to make these calculations, as 
 CH> longer battery life results in less sales (thus profits) in the 
 CH> future. 
Have you asked them?  What an absurd statement,  really.  Something technical 
of this sort is always going to sell better with data than without,  as long 
as the mfr. is making enough to cover the cost of producing that data.  The 
more that is known about them,  the more applications they'll be found in,  
therefore the more sales.
 CH> So, I guess I will have to keep records of my own, and find out 
 CH> what rate is best by trial and error.
That'll tell you more about what's what in terms of how any given type of 
battery will do in _your_ situation,  for sure.
How are you planning to define your discharge points,  by voltage or 
hydrometer reading?  What will you consider "discharged"?  I've seen specs 
for that going to,  say,  10.5 volts for a 12 volt battery,  though I 
wouldn't want to make it a habit to run them down that far.  Voltage can also 
be misleading if you're dealing with surface charge at all.
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