Based on how my truck responding on start up and the age of my battery, I assumed I needed a new one. I called to check prices a couple places. Costco and Big O's warranties did not compare and the downside to Costco is having to install it yourself, which is great for some people but not me. I called Autozone and described my issue and they said bring it in to verify whether it's the battery or alternator. I knew I was on borrowed time so I went there immediately and a sales associate came out and tested the battery, and confirmed it was just the battery. While he was ringing me up for the battery another sales associate was installing it. In and out in less than ten minutes.