I use AGM batteries even though they cost more. I tried a Walmart battery and it only lasted a year.
A size 24 battery is 10.8"L X 9.4" high X 6.81" L with 725 CCA
A size 27M(marine) is 12.75" L X 9.9" H X 6.75" W with 650 CCA and a 150 minute reserve.
A size 31 is 12.95" L X 9.5" H X 6.75" wide with 725 CCA and 185 minute reserve.
My tray has three slots built in. The engine battery is a 24 because that's all that will fit that battery tray.
I have a 2004 Windsport 32R class A.
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