I worked for AAA and always advised that people keep a jumper pack in their car, charge it every couple months using the wall plug to be sure it's fresh. I save people every winter at work because I have a battery pack in my car. When they're fiddling with cables, I hook my jump pack on and let them start.
Just be advised, the jumper pack is just like cables in that it doesn't deliver a charge to the battery, it will still be dead, so let the alternator charge the battery for at least a hal;f hour after you get going.
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