Battery Reconditioning Business

I came across a business that seems unique: battery reconditioning. I have been trying to decide whether the business is a winner. There is a guy who sells an ebook for fifty bucks, and he claims the business has six-figure potential. I wrote the guy asking how he came up with his projection but didn't get a response. Perhaps my email landed in his Spam folder. I found a number of websites that favorably reviewed the ebook, but since none of them actually put the information to use, and since they always posted links that probably results in their getting affiliate income, I have become skeptical.

This sounds like a winner, in theory, but is it actually doable? Opinions are welcome.