I like the jumper pack we have on the service truck at work...... It will start one of our trucks, with a completely dead battery, like nothing. I'll stick with it.
I don't even own one in my shop (the one I own). I just have a really good battery charger with a high boost rate. Battery charger is far more useful than a jumper pack IMHO. For the times when I went out on service, I had a set of jumper cables that I made from 4/0 ga welding cable with good ends on it. Off a diesel truck with two batteries, usually most everything would start even if the battery was dead, with the exception of large diesels. Those you had to let charge for a few minutes.
I say, buy a battery charger.
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