Learn how to hook up 2 batteries in a boat, including parallel and series.
Dual purpose group 27 marine battery and group 31M marine battery are built for different boats. Here's the complete comparison so you buy the right one the first time.
Starter, dual purpose, or deep cycle? AGM, flooded, or lithium? Group 24, 27, or 31? This guide answers every question, so you buy the right battery the first time.
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.
Know all things about deep cycle battery, including why need deep cycle marine battery, 8 real use cases on the water, and more about it...
A dual purpose AGM battery combines starting-battery performance (high CCA) with deep-cycle endurance (high Ah capacity and reserve capacity) in a single, sealed, maintenance-free package. Making it ideal for boaters, anglers, and RV owners who want simplicity without sacrificing performance.