So I got my colors mixed up that's why I said more then once to read the site. I put a yellow in the wife's car she left the rear dual DVDs running all night car started right up the next day and those testers those guys are using are junk. The old school ones that put an actual heavy 5sec load on the battery are the only ones I trust. When this battery goes in the XK or my wife's new car there both getting a yellow top well worth the extra few bucks.