My GF's 14 Kia Soul was completely dead this morning, all you could hear was the starter clicking, the lights came on but there was zero chance to start, I tried to jump it but it didn't matter, it was the same shit... 13 hours later when I get home from work I was going to take the battery out and go buy a new one but for fun I tried to start it and it fired right up without hesitation. I tested the battery, it was at 13.2 volts while running and 12.4 volts after I turned it off, and I let it sit for over an hour and checked again and it was still at 12.4 volts which from my understanding is a little low but still about 75% charge. Her car was dead about two weeks ago but I jumped it without issue and this is the first time since then that she has had a problem... does it sound like it is just the battery?.. I just don't understand how it could be completely dead and 13 hours later be fine and fire up without a problem. Any advice? I didn't buy the battery yet because I want to get some opinions and make sure it's all the battery before I buy a new one.