Posted by ernied on January 27, 2020 at 11:52:08 from (67.253.189.16):
In Reply to: Deep cycle battery posted by John in La on January 27, 2020 at 10:18:49:
Each cell is worth 2.2V, appears you have a shorted cell. Not much to do but replace. I have good luck with pulsed hi frequency charging and have personally used schumacher and progressive dynamics power converter. Adding acid is pointless unless the battery wall was damaged and repaired.
Fully charged, the battery plates are lead and the electrolyte is acid. As the battery is discharged the acid converts to water and the lead is dissolved/converted to lead sulphate which collects onto the lead plates. The sulphate is brittle and easily flakes off and once removed from the plates represent a loss of capacity. If enough flakes off and collects in the bottom, the cell shorts out. Pulsed hi frequency charging is more effective in breaking the sulfur bond and can be viewed as forcing the sulfur into water and back to acid. Taking a hydrometer measurement of the acid strength in each cell will give you an idea of relative cell capacity/health.
1. Avoid fully discharging the battery. 2. Slowly recharge. 5 amp for first 50%, 1-3 amp to finish (up to a 4D) 3. Use a battery maintainer with hi frequency pulsed DC 4. When a cell is shorted, game over.
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