Optima batteries

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2:AM Fabrication
Feb 7, 2008
Covina CA
I need a battery or two what’s the difference between the blue and the yellow top if you don’t mind explaining a bit. All I know is the blue is a marine battery ?
Blue and yellow (light grey case) are identical internally. Only difference is the yellow has side posts that GM commonly uses while the blue has an extra ring terminal post on top for accessories. These are considered a dual purpose battery starting/deep cycle.
Red tops have a dark grey case and are a starting only battery, not for deep cycle use.

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