I carry jumper cables in my trunk. Where I work, there have been times when our guests could not get their vehicles to start so have used them to give them a jump.

I had a battery die one time while shopping at a local nursery. They guy there had cables & jumped the battery. I drove the car to a local dealer & the needle kept moving around it is like don't die we can make it. I drove into the dealership & parked the car. The battery was deader then dead. Lady Luck was with me that day, thanks to the guy at the nursery, & my car angel.