Most Popular Marine / Boat Batteries
As Boats and boat motors become more electrified Marine Battery is your source for expert information, products and service for boat batteries, motors and accessories of all kinds. This is a question we get a lot.
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Whats are the most popular or common marine batteries?
Here are the most common marine battery group sizes along with their most popular chemistry options and typical amp-hour (Ah) ranges:
- Group 24 (10.25″ L × 6.81″ W × 8.88″ H)
- Flooded deep-cycle: 70–85 Ah
- AGM/gel VRLA deep-cycle: 70–85 Ah
- LiFePO₄: ≈42–51 Ah (≈60% of lead-acid capacity)
- Group 27 (12.06″ L × 6.81″ W × 8.88″ H)
- Flooded deep-cycle: 85–105 Ah
- AGM/gel VRLA deep-cycle: 85–105 Ah
- LiFePO₄: ≈51–63 Ah (≈60% of lead-acid capacity)
- Group 31 (13.00″ L × 6.81″ W × 9.44″ H)
- Flooded deep-cycle: 95–125 Ah
- AGM/gel VRLA deep-cycle: 95–125 Ah
- LiFePO₄: ≈57–75 Ah (≈60% of lead-acid capacity)
- Group 49 (H8) (19.5″ L × 10.8″ W × 11.3″ H)
- Flooded or AGM dual-purpose: ≈95–120 Ah; 700–900 CCA
- LiFePO₄ dual-purpose: ≈57–72 Ah equivalent (high CCA)
- 8D (20.7″ L × 10.9″ W × 9.4″ H)
- Flooded deep-cycle: ≈200–240 Ah
- AGM deep-cycle: ≈200–240 Ah
- LiFePO₄: ≈120–144 Ah (≈60% of lead-acid capacity)
When it comes to boating, a handful of battery models dominate in sales, recommendations, and user reviews. Below are some of the most popular marine batteries—covering starting, deep-cycle, dual-purpose, and lithium options:
- Optima BlueTop
A spiral-cell AGM battery that serves as both a starting and deep-cycle unit. Its compact size, 15× vibration resistance, and ability to be mounted in virtually any position make it a favorite among recreational boaters. Outdoor Life - Odyssey PC2250 (ODS-AGM6M)
A pure-lead AGM battery built for heavy-duty and commercial use. Offers up to 2,250 CCA (5-sec pulse), 240 min reserve capacity, and 400 cycles at 80% depth of discharge, all maintenance-free. Battery Guys - Interstate Deep-Cycle Batteries
Flooded lead-acid batteries known for their affordability, wide availability, and proven reliability. Available in multiple Group sizes (24/27/31) with a 24-month free-replacement warranty. Outdoor Life - Deka Marine Master
A traditional flooded deep-cycle battery with molded offset posts, stainless steel studs, and ample reserve capacity. Heavy but extremely durable and widely stocked by marine dealers. Outdoor Life - Trojan SM/SCS/TM Series
The SM series excels at engine cranking (highest CCA), the SCS series delivers maximum reserve capacity for deep-cycle use, and the TM/TMS models strike a balance between the two—making Trojan a top pick for “apples-to-apples” comparisons. Reddit - Lifeline GPL-4CT AGM
A high-end, pure-lead AGM battery boasting 5–8 year life spans and a flawless defect record. Engineered for extreme temperature tolerance and frequent cycling without maintenance. Impactbattery.com - Lithium Pros TM3165-36
A LiFePO₄ “all-in-one” solution that replaces up to three 12 V batteries. Weighs under 43 lbs, supports >3,000 charge cycles, and pairs with Bluetooth-enabled monitoring via the QuickView app. Outdoor Life
These models consistently top boat-owner forums, retailer best-seller lists, and expert gear round-ups—and cover a wide range of budgets, applications, and form-factor requirements.
