You may need a new battery. I recommend buying the ones at Nissan. They really are quality (surprisingly).
There are only 3 manufacturers of automotive batteries in the whole country. They are all just repackaged, labeled and branded at different price points and designed to different lonegricy points.
Probably can get the same battery for less without the Nissan name.
""As of May 1, 2013, there are three major automotive starting flooded battery manufacturers in the United States. There are four absorbed glass-mat (AGM) starting battery manufacturers and there are four flooded deep cycle battery/major deep cycle battery manufacturers in the United States.""