I’ve been around equipment and vehicles all my life. I know about safe handling, proper grounding, CCA, etc. Unfortunately, I don’t know diddly about AGM batteries or Ah vs CCA. I was told I need to find a better battery for my 06 Rhino 660. I’ve tried to research what will fit and I’ve found a 350 CCA U1 sized battery at Autozone. Right now, my machine is a little sluggish to crank over at times. New starter and relay are already installed. My current battery is pictured below. Built in 12/2020. Charging 13.3V at idle.