In my lifetime I've only see 1 battery explode while being jumped. It was one taxicab trying to jump another cab. Not paying attention to simple details caused that to happen. Jumper cables have been around since they started making cars, so you know they are a tried and true method of getting a vehicle started. Jump paks haven't been around that long, and I would be more leary of them causing damage to my vehicle over using cables. That is if they worked at all. I can see them being a item that gets put in your car and forgotten about. Then the one day when you need to be the hero of the day, they won't work because they're dead as a doornail. My jumper cables have never failed me, and they are cheap and don't require power just to do what they are intended to do. The current group of car owners will buy anything if the sales pitch is good enough. Mostly they're selling fear of what could happen if you don't buy their product. It's like like when the electric clothes drier companies started selling them. Why hang your clothes out on a line to dry for free, when you can buy a dryer, run venting, then run a 220 volt electric line. and have to pay for the electricity every time you use it?.,,