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You may want to read up on the use of "deep cycle" vs starting batteries. A starting battery rarely gets discharged and I think a deep cycle needs to be discharged every so often. IMHO the red-top is a better choice here, but I could be wrong.... Edit: A yellow-top is good if you have an...

Here is the info you need. BTW, lead acid batteries love cold weather for the low self discharge rate (they live longer), but want room temp for best cranking performance. Edit: The only reliable way to check your batteries is to get a hydrometer and measure the specific gravity.