Terrible. A Chevy dealership in Superior WI put a Super Start battery in my Chevy Impala SS. It was trouble from day one, going dead several times. The dealership refused to replace it stating it' holding a charge and there's nothing wrong with it. Today, waking up to -10F, the battery was completely dead. Frozen solid. Wouldn't even take a jump after sitting on cables for a while. Took it out bought an Optima- so far so good. The sales guy at Auto Zone laughed and said the Super Start battery had no business in my car!