Marine batteries come in three basic varieties: starting, deep-cycle, and dual-purpose. Starting batteries provide strong bursts of power to crank an engine and are not meant to endure repeated discharge/recharge cycles. Deep-cycle batteries, on the other hand, aren’t built to start an engine. Instead, deep-cycle batteries provide a consistent power output for a long period of time, perfect for running trolling motors and accessories.
Starting batteries and deep-cycle batteries aren’t meant to be substituted for one another; doing so will leave you stranded. Some manufacturers produce dual-purpose batteries, which attempt to combine the functions of starting and deep-cycle batteries into one package.
We’ve explored expert and user reviews of all types of boat batteries in order to bring you a list of the top rated . Our sources include Amazon, Bass Pro Shops, Advance Auto Parts, Sears, and BatteryMart.com.
ODYSSEY Trolling Thunder/Marine Dual Purpose Series ($98 and up)
- Above-average lifespan
- Long-lasting charge
- Initial cost
Top Review Sources:
- BatteryMart.com: 4.9/5.0 (75+ reviews) (PC625)
- Amazon: 5.0/5.0 (10+ reviews) (PC625)
- Amazon: 5.0/5.0 (3 reviews) (34M-PC1500)
ODYSSEY Trolling Thunder/Marine Dual Purpose batteries use AGM technology to deliver performance that tops lead-acid batteries. Trolling Thunder batteries are built to fill both starting and deep-cycle roles. The manufacturer claims reliable starting energy coupled with up to 400 cycles at 80% depth of discharge. Reviewers confirm these impressive claims, expressing satisfaction with the long charge times and strong cranking power. Though Trolling Thunder series batteries cost more than conventional marine batteries, they last from 3-10 years, fully recharge in four to six hours, can be mounted anywhere due to their no-spill design, have higher impact and vibration tolerance, and are maintenance-free. Here a rundown of the six 12-volt batteries in the line:
- PC625 – MCA@32 °F: 250, RC: 27
- PC925 – MCA@32 °F: 500, RC: 52
- 34M-PC1500 – MCA@32 °F: 1050, RC: 135
- PC1800-FT – MCA@32 °F: 1450, RC: 475
- 31M-PC2150 – MCA@32 °F: 1370, RC: 205
- PC2250 – MCA@32 °F: 1550, RC: 240
Many AGM batteries use lead alloys for their flat plates, but ODYSSEY uses pure lead, which extends battery life. ODYSSEY Trolling Thunder batteries come with three- or four-year warranties.
DieHard Platinum PM-1 ($280)
- Holds charge well while in storage
- Rare reports of premature failure
Top Review Source:
- Sears: 5.0/5.0 (15+ reviews)
The DieHard Platinum PM-1 features corrosion-resistant, tin-coated terminals, vibration protection, sealed construction, pure lead plates, and a three-year warranty. This AGM marine battery is dual-purpose; it can cover both starting and deep-cycle duties. It will typically last longer than lead-acid-type batteries. The Platinum PM-1 is a 12-volt unit capable of 1150 cold cranking amps at zero degrees Fahrenheit and has a reserve capacity of 205 minutes. It weighs 75 pounds and measures 9.5” H x 13” L x 6.8” W. Customers generally rave about the Platinum PM-1, citing its reliable performance and ability to start up after long periods of storage. Customers also have found the construction to be rugged enough to stand up to high levels of vibration and impact.
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