If you have an automotive or other lead-acid battery that isn’t working properly, you may be able to recondition it. Lead-acid batteries decline in performance most often because sulfur accumulates on the lead plates of the battery, corroding them and blocking electric current flow. You can use a common household chemical, magnesium sulfate (Epsom salts), to recondition a lead-acid battery. If you follow the proper procedure, the magnesium sulfate will remove the sulfur and restore the battery to normal operating condition.

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And lastly how much time does the batteries need to be charged?

Nanopulser - An Inside Reveal on How a Lead Acid Battery Works