So how do they compare:


Starting G-27 Battery:

-- Smaller Plates (shorter)

-- 7 pairs of positive & negative plates in each cell

-- Positive Plate Thickness = 2.20 mm Thick (0.087")


Let's break it down;


For years and years all we've heard is;


"Starting batteries have many more and much thinner plates".


Really?


The plates in this starting battery are actually 0.05 mm thicker than the deep cycle battery. While the cells are smaller in physical size they did cram one more positive and negative plate into the starting battery in order to deliver a slightly higher CCA rating.. This hardly qualifies as "many more plates and thinner plates".


While these two batteries are from different manufacturers they all mislead the consumer. Sure, the plates are taller on the deep cycle but the positive & negative plates are virtually the same exact thickness on the starting battery as they are on the deep cycle.


This "deep cycle" Kirkland battery lasted less than 35 real-world deep cycles. After those cycles it could barely muster 28 Ah's of accurately tested capacity.


Is this Costco/Kirkland/Johnson Controls battery really a deep cycle battery just because the sticker says so? If you think it is please call me, I have a bridge that's a killer deal...(wink)