Tom Ericson's EZ Battery Reconditioning program aka How To Recondition Batteries At Home book free download (.pdf). I’ve been using your course to recondition all kinds of batteries. I was actually just about to spend thousands of dollars for solar batteries but I searched around to see if there were other options before I did. Luckily I found your course! Because instead, I was able to get old free batteries (like you show how to do), recondition them, and have an entire battery bank for almost no cost! Absolutely incredible!