BlueMax Marine Group 31
Features
Features
8 Year Warranty
8 Year Warranty
BlueMax Marine Group 31 is backordered and will ship as soon as it is back in stock.
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Exceptional dual-purpose power for starting and deep-cycling all on one battery.
- Dual-Purpose Performance: Deliver a massive 1200 Cold Cranking Amps (CCA) to effortlessly start your marine engines while reserving 160Ah of deep-cycle capacity for house electronics.
- Massive Weight Reduction: Weighing only 38 lbs, this lithium battery shaves substantial weight off your vessel compared to traditional lead-acid equivalents, instantly improving speed and fuel efficiency.
- Intelligent Safety: Built with an Advanced Battery Management System (BMS) equipped with active cell balancing, low-voltage disconnect, and a reliable low-temperature charging cutoff.
- Proven Longevity: Engineered to provide up to 4,000 cycles at 80% Depth of Discharge, maximizing your return on investment over years of harsh marine use.
What This Upgrade Fixes
Eliminate the anxiety of a dead starter battery after running trolling motors and electronics all day long. This upgrade ends the routine maintenance, heavy lifting, and frequent replacements associated with traditional lead-acid marine batteries. It also solves the problem of underperforming electronics caused by voltage sag—our LiFePO4 chemistry holds a steady voltage until completely depleted.
What's Included
[FILL: WHAT'S INCLUDED]
Compatibility
This is a universal flat-fit design manufactured in the standard Group 31 form factor, meaning it works as a direct drop-in replacement for existing Group 31 marine or RV battery setups. It operates seamlessly with standard 12V alternators and marine charging systems supporting a 14.2V - 14.6V charging profile. Ideal for marine house power, engine cranking, RV house banks, trolling motors, and solar storage applications.
Installation
Estimated Time: 15–30 minutes
Difficulty: Beginner
Tools Needed: Basic socket set or wrench to disconnect the old battery and torque your existing ring terminals onto the new battery posts.
Key Specs
| Nominal Voltage | 12.8V (12V System) |
| Capacity / Energy | 160Ah / 1980Wh |
| Cold Cranking Amps | 1200 CCA |
| Max Continuous Discharge | 160A |
| Charging Voltage | 14.2V - 14.6V |
| Chemistry | Lithium Iron Phosphate (LiFePO4) |
| Cycle Life | 4,000 cycles at 80% DoD |
| Form Factor | Group 31 |
| Weight | 38 lbs |
| Operating Temperature | Discharging: -20°C to 60°C | Charging: 0°C to 45°C |
| Durability & Safety | IP67 Rated, Built-in Advanced BMS |
| Certifications | UL 1642, UL 1973, CE, RoHS, UN38.3 |
| Warranty | 8-Year Warranty |
FAQ
Can I use this battery to start my engine and run my trolling motor?
Yes. Unlike standard deep-cycle lithium batteries, this unit pushes 1200 CCA designed specifically for engine cranking, alongside providing 160Ah of true deep-cycle energy storage for motors and electronics.
Will this fit in my existing battery tray?
Yes, this is built precisely to a Group 31 blueprint. As long as your current setup accommodates a standard Group 31 battery, it is a simple drop-in swap.
Will the battery be damaged if I charge it in freezing weather?
No. The integrated BMS includes a low-temperature charging cutoff. If the internal temperature drops below 0°C (32°F), it automatically prevents a charge to protect the lithium cells from permanent damage.
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Let customers speak for us
Nice and easy install, they work great, much longer range and way better power. Best of all, NO MAINTENANCE
Tried cheaper lithium setups first and they couldn’t handle the amp draw. This one has been solid with no issues.
Absolutely Incredible Range. We replaced our 4 year old Trojan batteries this spring with the 210 AH dual battery kit and we are blown away! We use the buggy to secure the perimeter of a 300 acre lot in South Carolina. We typically put about 200 miles per week on this unit. We have been testing this kit for about a month now and we are getting every bit of 80 miles per charge. Its absolutely unbelievable. Thank you Fleet Lithium!
This screen was so easy to install. We installed our fleet lithium battery about 2 years ago, the screen just came out in April, it took 10 minutes to install and everything works perfectly. Thank you Fleet lithium!
After a few months of use I can confidently say this was worth it. No maintenance, great range, and consistent power every time. Huge upgrade from stock.
I should have just bought this first instead of wasting money on others.
I use my Prowler every day hauling feed and equipment. Other batteries kept shutting down under load. This is the only one that worked right. Glad I spent the money.
Runs strong every time. Exactly what I needed.
The range has doubled compared to my old setup. Installation was straightforward and the instructions were clear. I can now play multiple rounds without recharging.
Tried cheaper lithium setups first and they couldn’t handle the amp draw. This one has been solid with no issues.
Runs strong every time. Exactly what I needed.
No more issues with power cutting out. That alone made it worth it.
No more issues with power cutting out. That alone made it worth it.
Runs strong every time. Exactly what I needed.
Handles hills and heavy loads without hesitation. Very impressed so far.
