I had to replace the battery in my truck a couple of months ago, so I really could have used this RenGard Jump-Starter Power Station at that time. However, I did run down the battery (by leaving my headlights on for several hours) and tried jump starting it with this device. My first attempt failed. I checked the connections and tried again, but it still didn’t work. I finally realized I still had the headlights one (not that they were shining very brightly by this time). Once I turned them off, my next jump start attempt succeeded! I’m not sure why, but I was a little dubious that this product would work. It exceeded my expectation and worked quite well.
I received this item at a discounted price for an honest, unbiased review.