Here I have flipped the G-27 batteries around showing the stickers. I also laid out from L to R the negative plate, positive plate and the separators.


The West Marine battery is one of their highest CCA batteries and the Kirkland is anything but a "deep cycle" despite what the BS on the sticker says.


We often hear how different starting and "deep cycle" batteries are and when comparing a true deep cycle product to a starting battery there are definitely some major differences. In the case of these two batteries however the construction is more similar than different.


--Plate Separator Envelopes = Same Quality/Virtually Identical
--Negative Plates = Virtually Identical Thickness
--Positive Plates = Virtually Identical Thickness
--Plate Size = Deep Cycle Has Taller Plates
--Number of Plates = Starting Battery Has One More Plate Pair Per Cell