So i guess there is a part two to this battery show down ! Kirkland 20720 $104.99 MCA 685 CCA 550 Reserve Capacity 140 minutes Amp/HR 95 Costco only shows just the basic info on their deep cycles. All the details are in their battery catalog hanging off the shelf. Nautilius NA24DP/010-2499-8  $144.99 MCA 675 CCA (unlisted) Reserve Capacity 120 minutes Amp/HR 65   Kirkland 20720 $104.99 140*60 = 8400 8400*25 = 210,000 210,000 / 3600 = 58.33 amp/hr Nautilius NA24DP/010-2499-8  $144.99 120*60 = 7200 7200*25 = 180,000 180,000 / 3600 = 50 amp/hr   Kirkland 20720 $104.99 104.99/(58.33 amp/hr) = $1.79 per amp/hr NautiliusRead More →