I had no intention of writing a product review for Walmart but after witnessing the success of the Diehard 80/20/10/2 at resurrecting a 2 year dead battery back to full life, I had no choice but to pass on my advice - buy this if you want your money's worth! I originally purchased this (via online order/ship to store, which worked great and helped me avoid checkout lines) to maintain intelligently through the winter the newish deep cycle marine battery I bought in the spring. But before hooking up to the good battery, I thought I would put the Diehard to the test of its claimed ability to sense a bad battery and start a desulfation process. Sure enough, when I hooked it up the Diehard told me the battery was at 0% (in spite of being "charged" a few times 6 months ago). It then went to work, and stalled at 20% charge, but did not flash a failure so I let it continue to work. 2 hours later it jumped to 76%, but stalled there again, with no failure indications. I rode it out for 4 more hours while it sat at that number and then it suddenly started climbing bit by bit all the way to 100% Voila a new backup battery. How can you beat that?
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