[AT] desulphating battery chargers

[DAVIESW739 at aol.com]

This is from the site that I have mentions earlier I hope it answers your  
question. 

----------------------------------http://www.batterystuff.com/battery/battery_
tutorial.htm
A  Few Basics
The Lead acid battery is made up of plates, lead, and lead oxide  (various 
other elements are used to change density, hardness, porosity, etc.)  with a 35% 
sulfuric acid and 65% water solution. This solution is called  electrolyte 
which causes a chemical reaction that produce electrons. When you  test a 
battery with a hydrometer you are measuring the amount of sulfuric acid  in the 
electrolyte. If your reading is low, that means the chemistry that makes  
electrons is lacking. So where did the sulfur go? It is stuck to the battery  plates 
and when you recharge the battery the sulfur returns to the  electrolyte.

Walt Davies
Cooper Hollow Farm
Monmouth, OR  97361
503 623-0460