I've been looking, as I've been having issues with the current one when you combine cold and sitting idle for a couple of days... here at Wallymart Canada, they have the Optimas, and also "Energizer" brand.
A little research on the web seems to indicate that the Energizer is made by Johnson Controls, who also makes Die Hard and other "house brand" batteries, and who also recently bought out Optima.
The red top (RT below) is going for $179, the higher-end model of Energizer (EN below) is $109.
The specs are as follows, as best as I can recall:
RT - 1000 A
EN - 1000 A
RT - 800 CCA
EN - 795 CCA
RT - 3 year replacement warranty
EN - 3 year replacement warranty
RT - 10 year warranty
EN - 9 year warranty
Both are a nice step up from the stock battery at 600 CCA as I recall.
But I'm not clear on why I should spend an additional $70 for the red top.
Appreciate your thoughts
Dave