^1+. All Optima batteries are great, and no matter which one, Red or Yellow Top, they are the best. IMO. My experience with Red tops has been great, but used on classic cars where CCA where needed. But if left unattended, and drained, they seemed to not recover very well, if at all. But this is after a few years of use. I just switched to Yellow because I run alot of accessories, sometimes without vehicle running, and wanted extra recovery power. Just wanted to share my experience with both, again.