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I am using a Duracel Ultra 24m 800 cca (SLI24MHP)
Batteries Plus carries them for about $110
They carry a 27m as well but they have fewer CCA for some reason
Its a Marine Starting battery but they take a charge while the boat motor runs and are built for that
It is dual Post
I use the secondary posts to feed to my MSD electronics and the relay to my electric fans
My Car sits a lot but so far the Battery has lasted 2 years and shown no signs of decay
Last one lasted about 3 years