Baintech BTMARINELITH24/100 24V 100Ah Marine Lithium Battery

Purpose-built 24V marine lithium—engineered for the harsh conditions, vibration, and moisture of life on the water.

Product Overview

The Baintech BTMARINELITH24/100 is a 24V 100Ah LiFePO4 lithium battery specifically engineered for marine applications. Unlike standard 12V batteries adapted for boats, this purpose-built 24V system delivers the higher voltage required by serious marine electrical systems including bow thrusters, windlasses, large inverters, and professional navigation equipment. The 2560Wh energy capacity provides substantial power for extended time on the water without shore power or generator operation.

Built around A-grade prismatic LiFePO4 cells with marine-specific construction, this battery handles the unique challenges of marine environments: constant vibration from wave action and engine operation, potential water exposure, salt air corrosion, extreme temperature cycling, and the deep discharge/recharge cycles common to boats operating away from shore power. The integrated BMS provides protection against over-discharge, overcharge, over-current, and temperature extremes while supporting parallel and series configuration for scaled power systems.

The 100A continuous discharge capability powers high-draw marine equipment including electric propulsion systems, large inverters for household appliances, bow thrusters for docking, and windlasses for anchor operation. The matching 100A charge current accepts rapid charging from high-output alternators, shore power chargers, or solar arrays when you're at anchor. Suitable for sailing yachts, motor cruisers, liveaboard vessels, fishing boats, and any marine application requiring reliable 24V power with the weight savings and longevity advantages of lithium technology.

Key Specifications

• Nominal voltage: 25.6V (24V system)
• Capacity: 100Ah
• Energy capacity: 2560Wh
• Cell type: LiFePO4 A-grade prismatic cells
• Cut-off voltage: 20V
• Maximum continuous discharge current: 100A
• Maximum charging current: 100A per battery
• Charging mode: CC/CV (Constant Current/Constant Voltage)
• Charging voltage range: 28.4V–29.2V
• Standby/float voltage: 26.6V–26.8V (fully charged)
• Operating temperature: -20°C to +60°C
• Parallel configuration: Up to 4 units supported
• Series configuration: Up to 2 units supported (48V maximum)
• Construction: Marine-grade design for harsh environments
• Chemistry: LiFePO4 (Lithium Iron Phosphate)

Features & Benefits

Purpose-Built 24V Marine System: Engineered specifically for 24V marine electrical systems common on sailing yachts, motor cruisers, and larger vessels. The 24V architecture reduces current draw by half compared to equivalent 12V systems, allowing smaller cable sizes, reduced voltage drop, and more efficient operation of high-power equipment like bow thrusters, windlasses, and large inverters. Critical for vessels with substantial electrical demands.

100Ah / 2560Wh Substantial Capacity: The 100Ah capacity at 24V delivers 2560Wh of usable energy—enough to run a 3000W inverter at full load for nearly an hour, or power typical boat house loads (refrigeration, lighting, navigation electronics, autopilot) for 24+ hours between charges. The high energy density of LiFePO4 chemistry provides this capacity in a package far lighter and more compact than equivalent AGM or flooded lead-acid banks.

100A Discharge for High-Power Marine Equipment: The 100A continuous discharge capability powers demanding marine equipment including bow thrusters (typically 50–80A draw), electric windlasses (40–60A under load), large inverters for household appliances, and electric propulsion systems. Unlike lead-acid batteries that suffer voltage sag under high loads, lithium maintains stable voltage throughout the discharge cycle for consistent equipment performance.

100A Rapid Charge Acceptance: The 100A maximum charge current accepts rapid charging from high-output marine alternators (common on diesel auxiliary engines), shore power battery chargers, or large solar arrays. This fast charge acceptance means shorter engine running time, quicker turnaround at marina berths, and the ability to recover battery capacity during day-sailing via solar before anchoring for the night.

Marine-Hardened Construction: Purpose-built for the marine environment with construction addressing constant vibration from wave action, potential water exposure, salt air corrosion, and extreme temperature cycling from engine rooms to overnight lows. The robust housing and cell mounting system prevents internal damage from the pounding of rough seas, while corrosion-resistant materials withstand the aggressive marine atmosphere.

A-Grade Prismatic LiFePO4 Cells: Uses premium A-grade prismatic cells for reliability and longevity. Prismatic cells offer better space efficiency than cylindrical cells and superior thermal management compared to pouch cells. LiFePO4 chemistry provides the safest lithium technology, critical for marine applications where battery failures can have serious safety implications at sea.

Scalable with Parallel and Series Configuration: Supports up to 4 batteries in parallel for increased capacity (400Ah total at 24V), or 2 batteries in series for 48V systems common on larger vessels with 48V inverters and motor systems. This scalability allows the power system to grow with vessel electrical demands without replacing the entire battery bank.

Wide Temperature Operation: Functions from -20°C to +60°C, handling both winter sailing in cold climates and extreme heat in engine rooms or tropical conditions. The temperature range ensures reliable operation regardless of season or geographical cruising area. Critical for liveaboard cruisers operating year-round in diverse climates.

Intelligent BMS Protection: The integrated Battery Management System monitors and protects against over-voltage, under-voltage, over-current, over-temperature, and short-circuit conditions. Cell balancing ensures all cells charge and discharge evenly, maximizing battery lifespan. The BMS cutoff at 20V prevents deep discharge damage while the controlled charging voltage (28.4–29.2V) prevents overcharge.

Long Cycle Life Lithium Advantage: LiFePO4 chemistry delivers 3000–5000 cycles (typical for quality marine lithium), vastly outlasting the 300–500 cycles of lead-acid alternatives. For cruising vessels cycling daily or liveaboards with regular deep discharge cycles, lithium batteries pay for themselves through longevity while eliminating the maintenance burden of flooded lead-acid systems.

Technical Specs

Electrical Specifications:

• Nominal voltage: 25.6V
• System designation: 24V
• Capacity: 100Ah
• Energy: 2560Wh (100Ah × 25.6V)
• Cell type: LiFePO4 A-grade prismatic
• Chemistry: Lithium Iron Phosphate

Voltage Parameters:

• Cut-off voltage (low): 20V
• Nominal voltage: 25.6V
• Standby/float voltage (full charge): 26.6V–26.8V
• Charging voltage range: 28.4V–29.2V

Current Specifications:

• Maximum continuous discharge: 100A
• Maximum charging current: 100A per battery
• Peak discharge current: Not specified

Charging Specifications:

• Charging mode: CC/CV (Constant Current/Constant Voltage)
• Bulk charge voltage: 28.4V–29.2V
• Float/storage voltage: 26.6V–26.8V
• Maximum charge current: 100A

Environmental Specifications:

• Operating temperature: -20°C to +60°C
• Storage temperature: Not specified (confirm from manufacturer)
• Protection rating: Not specified (confirm IP rating for marine use)

Configuration Options:

• Parallel: Up to 4 units (400Ah total capacity)
• Series: Up to 2 units (48V system)
• Maximum system voltage: 48V (2 in series)

Physical Specifications:

• Dimensions: Not specified (confirm from manufacturer)
• Weight: Not specified (confirm from manufacturer)
• Terminal type: Not specified (confirm connection type)
• Housing: Marine-grade construction

Protection Features:

• Over-voltage protection
• Under-voltage protection (20V cutoff)
• Over-current protection
• Over-temperature protection
• Short-circuit protection
• Cell balancing

Compatible With / Goes Well With

• 24V marine battery chargers with lithium profiles
• High-output marine alternators (100A+ charging capability)
• 24V solar arrays with MPPT charge controllers
• 24V bow thrusters and electric windlasses
• 24V to 240V marine inverters (2000W–3000W+)
• Marine navigation systems and electronics
• 24V refrigeration systems and marine fridges
• Electric propulsion systems (24V trolling motors, pods)
• Autopilot systems requiring 24V power
• VHF radios, AIS, radar, and communication equipment
• LED navigation and interior lighting systems
• Watermakers and reverse osmosis systems
• Marine battery monitoring systems
• Series/parallel BMS systems for expanded banks
• Marine-grade heavy cable (25mm²–50mm² for 100A loads)
• Anderson plugs or marine-grade battery terminals

Note: Confirm waterproof rating (IP rating) and mounting orientation requirements for your specific marine installation.

Frequently Asked Questions

What's the advantage of 24V over 12V for marine systems?

24V systems reduce current draw by half for the same power, allowing smaller cable sizes, less voltage drop over long cable runs, and more efficient operation of high-power equipment. For example, a 2000W inverter draws 85A at 24V versus 170A at 12V—the 24V system needs half the cable size and experiences far less voltage drop, particularly important on boats with long cable runs from battery to equipment.

Can I charge this with my existing 24V lead-acid charger?

Only if your charger supports lithium charging profiles. Lithium batteries require specific voltage parameters (28.4–29.2V for this battery) and charge termination based on current taper, not just voltage. Lead-acid chargers that go to higher voltages (30V+) or use equalization cycles will damage lithium batteries. Use a lithium-compatible marine battery charger or verify your existing charger's compatibility.

How many batteries do I need for typical liveaboard power needs?

Typical liveaboard consumption is 100–200Ah daily at 24V. One 100Ah battery provides one day's autonomy, two batteries (200Ah) provide two days, etc. Most cruising sailors install 200–400Ah (2–4 batteries in parallel) to handle 2–3 days without charging, accounting for the 80% depth of discharge recommendation and reserve capacity for cloudy periods affecting solar charging.

Will this battery work with my bow thruster?

Yes, provided your bow thruster is designed for 24V operation and draws less than 100A continuous. Most 24V bow thrusters draw 50–80A under load, well within this battery's 100A continuous rating. However, verify your thruster's specifications—some larger thrusters may have brief peak draws exceeding 100A, which would require multiple batteries in parallel.

What's the weight savings versus lead-acid?

An equivalent 100Ah 24V lead-acid bank (typically requiring two 12V 200Ah batteries wired in series for comparable usable capacity) weighs 100–120kg. A single lithium marine battery typically weighs 25–35kg, saving 70–90kg. This weight reduction high in the boat improves stability and reduces displacement, particularly significant on sailing yachts where every kilogram matters.