Peter, Not really a "engineer answer - but what do you have to loose? But - I was under the impression that the problem was shorted plates, not a sulphated battery. If you can get access to the individual cells.it should be easy-ish to figure out what's wrong. Basically, when under charge and under load all cell voltage should be close to each other. Any significant (20% ?) variation indicates a cell problem that will be hard to fix. 1. One or more cells at a much lower voltage than the others when left unloaded for 12hrs or so following charging - shorted plates. 2. High voltage on one or more cells when attempting to recharge - open circuit or poor cell bond connection. 3. Inability to accept charge current - even with elevated charge voltage - sulphated plates. Sulphation may be able to be reversed to some extent - there are units that apply a high voltage pulse to the battery to attempt to break down the sulphation.Or you can try it manually with a power supply & low current limit (Not really recommended) . It can take weeks to show much response & the battery capacity is nothing like original. For a flooded battery, I've also heard of people charging it in reverse polarity & then discharging & recharging correctly to "fix" sulphation. This will totally stuff an AGM or gell cell however. RP On 4 September 2014 03:03, Peter wrote: > Has anyone tried the MgSO4 salt solution adding methods shown on youtube? > To > recover somewhat suplhated batteries "from the dead"? I can't find a > scientific description of the process but one can hope I guess. > > ("engineer" type answers get extra karma points :) > -- 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 .