I tested a chemical desulfator (This is not an electronic desulfator) on a dead car battery, a car battery that was dead for months and wouldn't take a charge. Watch the video and see what happens. This product takes a number of days to work fully, 10 days is the recommended working time to get the full results of the additive, so not something that will give you a roadside fix for a dead battery. This is a product I bought from eBay for $15.89. They send you enough chemical(s?) to treat 6 automotive batteries. Even if the chemical does not restore a battery all the way back to car worthy, the restored battery might find use as a storage battery for a solar cell hobbyist that wants to power an electric fence, supply power to a LED lighting system and so on. The idea would be to stay away from hard, short duration, amperage demands like a car starter has. The CCA number , the Cold Cranking Amps of a battery is an important number for batteries used in automobiles as the starter motor is the biggest single drain on your battery when it is engaged and the total amp hour rating of the battery is something completely different. That number refers to the total energy storage capacity of the battery, something this product might improve without helping the CCA. I will let you run your own experiments. I recommend charging batteries of any type away from houses and garages in case something goes wrong you will not burn your house or garage down