Wow, now I had no doubts! NOT NOW. they really work for me. I now have 3.1 for my caravan (that's why I bought my first one. Yes, it breaks down sulphates and holds the charge much better). #2 Since it worked so well on a trailer, I have a diesel truck that I use primarily for towing a trailer and it sits a lot. #3 for my daily driver. with the voltage we impose on our batteries with all the extra electrical elements. I went broke for the price. So far EVERYTHING is GREAT. yes, i will buy again. Why wait, buy one or two to take care of your battery.
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