A little less than a week ago, it seemed like my battery completely died. I couldn't start the car, use the keyless entry, the electronics wouldn't turn on and I couldn't put the car in neutral. After getting the car "jumped" it seemed to run fine again, until today. Today I noticed my radio kept turning on and off and I stopped at a bank, but when I tried to unlock the doors on the car, it wouldn't work and sure enough the car wouldn't start. After waiting two minutes I heard a noise from the CD player so I decided to try starting it again and it worked. I drove it a few times and then the same problem occurred again. My battery is consistently at 13V as well. Could this be an alternator problem or a bad battery or something different? I'm going to have to bring in the car tomorrow, but until then I wanted to see if anyone had a clue what it might be a result of.