How can we reverse the chemical reaction of a lead acid battery without the addition of energy?

While it may be possible to reverse the reaction in a lead acid battery using chemicals it is not a wise thing to do. You would have to open the case of the battery which is very dangerous. Car batteries build up internal pressure, and attempting to pry one open will result in sulfuric acid being sprayed out onto the unlucky individual with the pry bar in hand.

Your best bet (if you need do do so at all) is use something like this: http://www.instructables.com/id/Desulfator_for_12V_Car_Batteries_in_an_Altoids_Ti/ It will do what you want, with out the risk of melting you skin off. More.

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