Been shopping to replace a 6 year old group 75 AC-Delco 72 month professional series battery. I've always used Delco batteries because they were so well built. Ended up at a GM dealer eventually because they're not available at K-mart or the chain stores anymore. Anyway, the parts guy plops the current Delco replacement to my old battery on the counter and its virtually indentical to a Pep-boys Pro-Start battery wearing an AC-Delco decal. No reinforced ribbing on the case, no built in green eye hydrometer, and vent caps to replace the previously maintenance free sealed case. What a shame, quality parts is one of the things that made GM such leader at one time. Finally went with the 60 series Delco battery just to get a vent cap free sealed case. Made in Korea no less and definetly light weight construction. Have one of these in another car that I got on clearance at RS Strauss, a year and half old, working okay so far, we'll see how it lasts.