I have reconditioned several batteries and about to do another.. First you can buy premixed acid solution from any parts store and its right around 10 to 15 bucks.
First thing is remove battery from truck/car and make sure your wearing proper PPE for the job.. dont be complacent because if it gets in your eye your almost guaranteed to go blind. You want to get a large enough container to set the battery down into. Pull the covers and pour all the contents into that container. Now this is critical make sure you save about 1/5 of that old acid, put in seperate container and set off to the side. Mix up a gallon of regular water and baking soda and slowly pour that into the battery it will come up at your so step back. Pour some baking soda in the container to neutralize all of the remaining old acid.. pour the battery out into the container and rinse out. Do this about 5 X .Me personally I used 2 step ladders with some old wire closet shelving I had and put it between the 2 ladders, and place the battery face down and rinse it out really good. When you think youve rinsed it enough, rinse it again. Any left over baking soda will neutralize the new acid. Next pour some new acid you bought or make your own with distilled water and epsom salt. I think its 1 cup salt to gallon of water. Getting it premixed is full proof. So pour the new acid in the battery and top off with the old acid you set aside. Put the caps back on and do a trickle charge overnight if possible, if you cant wait you can rapid boost it but stay close because it will boil over. Since the old acid is neutralized you can do with it as you will, it is no longer hazardous. There ya have it.
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