Lithium Pros N31-12S 12V LiFePO4 Group 31 Marine Starting Battery with NMEA 2000

The Lithium Pros N31-12S is a 12.8V lithium iron phosphate (LiFePO4) Group 31 marine starting battery built for boaters who demand reliable engine starts and full network integration. Part of the Lithium Pros N Series, this battery pairs advanced LiFePO4 chemistry with a built-in NMEA 2000 port, putting real-time battery data directly on your multifunction display.

NMEA 2000 Network Integration:

• Integrated waterproof M12 NMEA 2000 port connects directly to the backbone — no gateways or adapter cables required
• Broadcasts voltage, state of charge, current, time remaining, and temperature to all compatible MFDs
• Plug-and-play compatible with all NMEA 2000 multifunction displays
• Reports standard battery PGNs: 127506, 127508, and 127513, plus alert PGN 126983
• Up to 50 N Series packs can share the same NMEA 2000 network address space

Advanced Battery Management System:

• Fully integrated digital BMS provides full protection against over-voltage, under-voltage, over-current, short circuit, and temperature extremes
• Built-in heaters for reliable cold-weather charging, managed through the Lithium Pros app
• Records warnings and alert events with real-time/date stamps
• Cumulative lifetime amp-hours tracking
• Compatible with all outboards and alternators

Key Specifications:

• Voltage: 12.8V (LiFePO4)
• BCI Group Size: 31 (13"L x 6.81"W x 8.43"H)
• Chemistry: Lithium Iron Phosphate (LiFePO4)
• Enclosure: IP67-rated — resists salt spray and momentary submersion
• Compliance: ABYC E-13 compliant for seamless wiring integration
• Cells: EV-grade, IEC 62133 tested
• Assembled and tested in Tennessee, USA

Why Upgrade to Lithium Pros N Series?

• Significantly lighter than equivalent Group 31 AGM batteries
• Recharges up to 5x faster than lead-acid batteries
• Over 5x the cycle life of standard lead-acid batteries
• 96% charge efficiency versus approximately 75% for lead acid
• Ideal for saltwater center consoles, offshore boats, bass boats with NMEA 2000 backbones, and vessels with complex house loads

The N31-12S is a direct drop-in upgrade for any 12V BCI Group 31 AGM or lead-acid starting battery, delivering superior cranking power, intelligent battery monitoring, and dramatically reduced weight — all in the same proven Group 31 footprint.