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Can I Use Deep Cycle Batteries as Cranking Batteries?

If you ask can you use deep cycle batteries as cranking batteries? The technically is yes, but usually not a good idea. A deep cycle battery can spin a starter motor, but its lower CCA rating and sharper voltage drop under load can cause problems with modern engine computers, leading to hard starts, failed starts, and a shorter battery life. The smarter fix for most boaters is a dual purpose AGM battery, which handles both jobs by design.

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