Thanks! As far as I know, there is no way to "blast it off" if a partial over-charge at a low rate does not re-convert it. BUT, believe it or not, some important aspects of lead acid battery chemistry have never been settled and are still active areas of research among the small community who still studies such things. The best book on the subject that I know is Valve-Regulated Lead Acid Batteries by Patrick Moseley, et al. but it is VERY technical and requires electrochemistry knowledge to make sense of some parts. I work for a company (Kiva Systems) which uses VRLA batteries in mobile robots and I had to do quite a bit of research on them in order to help optimize our algorithm for battery management. On Sun, Sep 7, 2014 at 1:34 PM, Peter wrote: > Excellent explanation Sean, thanks. So, the redux is, that there is no wa= y > to blast off the hard sulphate off the plates after the fact? > > -- Peter > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .