Even in new cars and trucks, charging systems can fail, or a battery drain can slowly siphon power away while sitting. Even if you do everything right, they don’t last forever: You should expect to replace one every five to seven years, depending on where you live and how you use your car. There are a lot of reasons to end up with a dead battery. If you had a dead or weak battery and you were on your own, you had to get to a phone or flag down another motorist to have a chance of getting going again. Everyone else carried (and still should) jumper cables, which require two cars and enough knowledge not to short them out. They were heavy lead-acid automotive batteries that only garages and tow truck drivers used. Between the invention of the self starter and the end of the 20th Century, the best portable car jump starters weren’t something you carried with you.
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