It isn’t the battery at all.
If your battery dies and your attempts to get the car started using jumper cables doesn’t work, there is a good chance the problem is not the battery at all. In addition to the battery, the starter and the alternator must be functioning in order for the car to start. If you turn the key and all you hear is a clicking sound, you may have a problem with your starter. If you turn the key and hear a whining sound or nothing at all, it may be a problem with the alternator. Your repair shop will be able to diagnose the problem although you may have to have it towed there if you can’t get it to start.
So, if you are having trouble starting the car, don’t assume it is the battery. Your best bet, whenever the battery dies, is to have your repair shop take a look so that you don’t find yourself stranded on the side of the road.