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I'm kind of a caveman, so I can't tell you that this is what you're looking for.

http://www.evdl.org/pages/hartregs.html

Lee Hart had a lot of great projects out there. A DC/DC-based battery equalizer looked really neat, but I could only find bits an pieces of his specs. I think it was one of the casualties of Geocities being shut down.
 

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Zener regulators, based on
the well-known design that Lee Hart created.


Anyone have the specs on this?
Wiring diagrams etc.?
I used 10 of them for my project, but recently changed to 10 small chargers in series instead! http://teva2.com/projects.htm#batbal

They are not very effective, but they work. Using larger diodes could increase the balancing current.
 
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