[AT] desulphating battery chargers

[DAVIESW739 at aol.com]

_http://www.uuhome.de/william.darden/carfaq16.htm_ 
(http://www.uuhome.de/william.darden/carfaq16.htm) 

16.3. How do I recover sulfated batteries?
Here are three methods to  try to recover permanently sulfated batteries:
16.3.1. Light  Sulfation
Check the electrolyte levels and apply a constant current at 2% of  the 
battery's RC or 1% of the AH capacity rating for 48 to 120 hours at 14.4 VDC  or 
more, depending on the electrolyte temperature and capacity of the battery.  
Cycle (discharge to 50% and recharge) the battery a couple of times and test its  
capacity. You might have to increase the voltage in order to break down the 
hard  lead sulfate crystals. If the battery gets above 125° F (51.7° C) then 
stop  charging and allow the battery to cool down before continuing.
16.3.2. Heavy  Sulfation
Replace the old electrolyte with distilled, deionized or  demineralized 
water, let stand for one hour, apply a constant current at four  amps at 13.8 VDC 
until there is no additional rise in specific gravity, remove  the electrolyte, 
wash the sediment out, replace with fresh electrolyte (battery  acid), and 
recharge. If the specific gravity exceeds 1.300, then remove the new  
electrolyte, wash the sediment out, and start over from the beginning with  distilled 
water. You might have to increase the voltage in order to break down  the hard 
lead sulfate crystals. If the battery gets above 125° F (51.7° C) then  stop 
charging and allow the battery to cool down before continuing. Cycle  (discharge 
to 50% and recharge) the battery a couple of times and test capacity.  The 
sulfate crystals are more soluble in water than in electrolyte. As these  
crystals are dissolved, the sulfate is converted back into sulfuric acid and the  
specific gravity rises. This procedure will only work with some  batteries.
16.3.3. Desulfators
Use a desulfator also known as a pulse  charger. A list of some of the 
desulfator or pulse charger manufacturers is  available on the Battery References 
Links List at http://www.batteryfaq.org.  Despite manufacturer's claims, some 
battery experts feel that desulfators and  pulse chargers do not work any better 
at removing permanent sulfation than do  constant voltage  chargers.
------------------------------------------------------------------------------
------------------------
I  test my case this is from the experts that make batteries not some shade 
tree  Mech.  
Walt Davies
Cooper Hollow Farm
Monmouth, OR 97361
503  623-0460