I have old batteries I can provide to test desulfator technologies.
 
I have a set of twelve six year old Sam's Club batteries in my home system that I am planning on retiring in the near future.  24v system, APC Powercenter with relay style charge controller, factory setpoints, EQed far too seldom (something about the cobbler's children having no shoes comes to mind...)  The plates are beginning to wear thin, and I can't hold as high a voltage as before when running large loads.  Average depth of discharge on a daily basis is to 90%, with deep discharges every month or so for tools, weather & parties to 50%. 
 
They're not totally used up, nor are they in fresh condition.  Probably an ideal set for A/B/Control testing.  3 24v 220AH or 12v 440AH strings, or 6 12v 220AH sets to compare competing technologies. 
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