A couple weeks ago I spent my lunch hour relaxing in the back of my Jeep listening to music without the engine running. When I left for work that day, my Jeep didn't want to start the first time I turned the key. I gave it a few seconds and tried again and it started, but not that well.
Yesterday I went to go leave work again, and it wouldn't start at all. The GPS unit would come on and I could listen to music, but it wouldn't start. I got myself boosted from a battery and went home. I used one of those motomaster chargers and left it charging all night long. I took it off the charger this morning and it started fine, but when I tried to go somewhere for lunch today, it wouldn't start again.
I'm going to go buy a new battery in a little bit but I'm wondering if anyone can tell me for sure that it's the battery, considering I can still listen to music and lights turn on.
Also, if I do go and buy a new battery, but it ends up being the alternator, how long will it be before the new battery is dead because the alternator isn't charging it?