Battery issue

[xstortion]

A little back story.

I replaced my battery at the beginning of the season. I had no problems until recently. I rode my bike into work during lunchtime. I went back out approximately 3 hours or so and it wouldn't start at all. After a few seconds of starting the lights dimmed and went out. Understand that I didn't leave any lights on or anything and the thing was dead.

So my solution was to jump it and get it back to my house and charge up the battery. I charged it up for a few days and everything seemed fine. I rode it to work again everything looked good. When I went to ride it during lunch all the lights turn of and the bike began to stall out.

My question is, is this simply the battery or is there another problem?