Looking to change my battery. Mine is over 5 years old right now. Recently, after driving on the highway for about a tank of gas, it wouldn't turn the starter over. I had to get a jump from a fella while in Wyoming yesterday. Also, my lights will dim when I turn on any electrical accessory or touch the brake (even if at highway speeds/high rpms) Local auto parts store has a couple options for $140-$180 (both have the same numbers...CCA: 640, CA: 800), but my sam's club has an AGM battery with 36 month replacement for $145 (CCA: 640, CA: 800). I've read a little bit about AGM's needing special charging systems, and that they can be over charged. Any thoughts?