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Lloyd bPlease go to Tesla chargers and go to a book called solar secrets by Peter Lindemann this is a book that explains the charge discharge of a 12 volt lead acid battery very well. It has exerpts from a book written in 1923 on the care and repair of lead acid batteries and the technology holds to this day. Basically if you charge a lead acid battery with too much current the sulfation burns off, falls to the bottom of the cell and shorts out the cell. The sulphation needs to be returned to a liquid and in order to do this you will need 15.2 to 15.4 volts at very well controlled current The best charger to do this is a solar panel, thus the book solar secrets. The people at Tesla Chargers are all Electronics engineers and are very knowledgable in this field. Thanks for your time.