Replaced battery

[Thefancybum]

Hey so I was having problems with what I thought was my battery. The first day this problem started it was 100 degrees out and my car had trouble starting. This continued for about a week, my car would start fine if it wasn't hot but would have trouble when it was hot from being i'n the sun. I assumed that this was my battery.

So I finally got around to switching today because I was busy with school and got a little sick.

But when I took out the old batter the green yellow black indicator which say if the battery doesn't have a charge or needs to be replaced. My old battery says that it's just not charged.

I also could not find a manufacture date on the battery but there is an 08 written i'n pen which I'm assuming is the date it was installed.

What I am really worried about is that my problem is not i'n fact my battery, but that it's not being charged.

If you guys could please help me diagnose this problem and make sure everything is fine with my car I would really appreciate it.

Thanks
Aron