Bests & Worsts Reviews from Amazon

Won't hold a charge even sitting in my house. This is the most frustrating thing I've ever encountered. I live in MN. It's cold. That's why I bought this. When it's really cold, sometimes my car needs a little extra 'help' to start. I bought the model recommended for my vehicle, followed the charging instructions that arrived with it, and was able to use it ONCE. After the initial use, it won't hold a charge. I keep the thing in my house so that the cold won't drain it but found that it's not holding a charge overnight EVEN SITTING IN MY HOUSE! What a colossal waste of money. When I plug it in, it shows no lights at all. I leave it plugged in to charge until the green light has been showing for several hours. Then I unplug it. When I turn it on again the next day to see if there's a charge, if I'm lucky, I'll have one red light. If I'm not lucky, there's no lights at all.