Heavy Sulfation; Common Causes Of Battery Failures - CareUcar Battery Analyzer User Manual

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12.2. Heavy Sulfation

Replace the electrolyte with distilled water, let stand for one hour, apply a
constant current of four amps at 13.8 VDC until there is no additional rise in
specific gravity.
Remove the old electrolyte, wash the sediment out, replace with fresh
electrolyte, and recharge. If the specific gravity exceeds 1.300, then remove the
old electrolyte, wash the sediment out, and start over with distilled water.
If the battery electrolyte rises above 110° F (43.3° 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 distilled water than in electrolyte. As
they are dissolved, the sulfate is converted back into sulfuric acid and the
specific gravity rises. These techniques will only work with some batteries.
13.0 – Common Causes of Battery Failures
The most common causes of premature battery failures are:
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1. Loss of electrolyte due to heat or overcharging.
2. Lead sulfation in storage.
3. Undercharging.
4. Old age (positive plate shedding)
5. Excessive vibration.
6. Freezing or high temperatures.
7. Using tap water which causes calcium sulfation.
8. Positive grid corrosion or growth due to high temperatures.
9. Fast recharging at rates greater than C/10.
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