Baintech BTMARINELITH36/100 36V 100Ah Marine Lithium Battery

High-voltage marine power—36V system for electric propulsion, high-efficiency inverters, and serious offshore capability.

Product Overview

The Baintech BTMARINELITH36/100 is a 36V 100Ah LiFePO4 lithium battery specifically engineered for marine applications requiring higher voltage systems. Operating at 38.4V nominal (36V system designation), this battery delivers 3840Wh of energy capacity—the highest energy density in Baintech's marine lithium range. The 36V/38.4V architecture is increasingly common in modern marine electrical systems, particularly for electric propulsion systems (trolling motors, pod drives), high-efficiency inverters, and vessels transitioning away from traditional 12V/24V systems.

Built around A-grade prismatic LiFePO4 cells with marine-specific construction, this battery handles the demanding conditions of marine environments: constant vibration from wave action and propulsion systems, potential water exposure, salt air corrosion, extreme temperature cycling, and the deep discharge/recharge cycles inherent to vessels operating away from shore power. The integrated BMS provides comprehensive protection while supporting parallel configuration for scaled capacity.

The 100A continuous discharge capability powers substantial loads including electric propulsion motors, large inverters (3000W+ at 36V), bow thrusters, windlasses, and complete house electrical systems. The matching 100A charge acceptance enables rapid charging from high-output alternators, shore power systems, or solar arrays. At 27kg and compact dimensions (535mm × 190mm × 220mm), this battery delivers exceptional energy density while remaining manageable for single-person handling during installation or maintenance.

Suitable for sailing yachts with electric auxiliary propulsion, motor vessels with electric drives, fishing boats with electric trolling motors, and any marine application benefiting from the efficiency advantages of 36V systems. The 5-year manufacturer warranty provides confidence for the significant investment in lithium marine power.

Key Specifications

• Nominal voltage: 38.4V (36V system)
• Capacity: 100Ah
• Energy capacity: 3840Wh
• Cell type: LiFePO4 A-grade prismatic cells
• Cut-off voltage: 30V
• Maximum continuous discharge current: 100A
• Maximum charging current: 100A per battery
• Charging mode: CC/CV (Constant Current/Constant Voltage)
• Charging voltage range: 42.6V–43.8V
• Standby/float voltage: 39.9V–40.2V (fully charged)
• Operating temperature: -20°C to +60°C
• Charging temperature: 0°C to +55°C
• Parallel configuration: Up to 4 units supported
• Series configuration: 1 unit only (no series stacking)
• Dimensions: 535mm (L) × 190mm (W) × 220mm (H)
• Weight: 27kg
• Warranty: 5 years manufacturer warranty
• Construction: Marine-grade design for harsh environments
• Chemistry: LiFePO4 (Lithium Iron Phosphate)

Features & Benefits

36V High-Voltage Marine System: Engineered for 36V electrical systems offering significant advantages over 12V/24V architectures. At 36V, current draw is reduced by 66% compared to 12V for the same power, enabling even smaller cable sizes, minimal voltage drop, and highly efficient operation of electric propulsion systems and large inverters. The 38.4V nominal voltage matches modern electric trolling motors, pod drives, and high-efficiency marine inverters designed for 36V operation.

100Ah / 3840Wh Maximum Energy Density: The 100Ah capacity at 38.4V delivers 3840Wh of usable energy—50% more than equivalent 24V batteries and 3× more than 12V systems. This exceptional energy density powers electric propulsion for extended periods, runs large inverters for household loads, or provides multi-day house power for cruising vessels. The high energy content in a single battery simplifies installation and reduces system complexity.

100A Discharge for Electric Propulsion: The 100A continuous discharge capability is specifically suited for electric propulsion systems including 36V trolling motors (Minn Kota, MotorGuide), electric pod drives, and auxiliary electric propulsion on sailing yachts. It also powers large 36V inverters (3000W+ continuous), bow thrusters, and substantial house loads. Lithium's stable voltage throughout discharge ensures consistent motor performance unlike lead-acid voltage sag.

100A Rapid Charge Acceptance: The 100A maximum charge current accepts rapid charging from high-output charging sources. For electric propulsion applications, this means quick recharging between fishing spots or during day-sailing under main propulsion. For cruising vessels, rapid charge acceptance maximizes solar harvesting during peak sun hours and minimizes generator runtime when charging from shore power.

Marine-Hardened Construction: Purpose-built for the marine environment with construction addressing constant vibration from propulsion systems and 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, critical for reliability when far from shore.

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

Scalable Parallel Configuration: Supports up to 4 batteries in parallel for increased capacity (400Ah total at 36V), delivering 15,360Wh of energy storage. This massive capacity suits larger vessels with substantial electrical demands, extended cruising autonomy requirements, or electric propulsion systems needing extended range. Parallel configuration maintains 36V system voltage while quadrupling capacity.

Wide Temperature Operation: Functions from -20°C to +60°C discharge, handling winter sailing in cold climates and extreme heat in engine rooms or tropical conditions. The charging temperature range (0°C to +55°C) ensures safe charging in diverse climates. Critical for vessels cruising through multiple climate zones or operating year-round in extreme environments.

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 30V prevents deep discharge damage while the controlled charging voltage (42.6–43.8V) prevents overcharge.

Compact 27kg for High Energy Density: At 27kg, this battery delivers 3840Wh in a package far lighter than equivalent lead-acid systems (which would require 80–120kg for comparable usable capacity). The weight savings improves vessel stability, reduces displacement, and makes handling during installation or maintenance manageable for one person. Dimensions (535 × 190 × 220mm) fit standard marine battery compartments.

5-Year Manufacturer Warranty: Baintech backs this premium marine battery with a comprehensive 5-year warranty, demonstrating confidence in LiFePO4 longevity and BMS protection. This extended warranty provides peace of mind for the significant investment and reflects the battery's design for long-term reliability in demanding marine environments.

Technical Specs

Electrical Specifications:

• Nominal voltage: 38.4V
• System designation: 36V
• Capacity: 100Ah
• Energy: 3840Wh (100Ah × 38.4V)
• Cell type: LiFePO4 A-grade prismatic
• Chemistry: Lithium Iron Phosphate

Voltage Parameters:

• Cut-off voltage (low): 30V
• Nominal voltage: 38.4V
• Standby/float voltage (full charge): 39.9V–40.2V
• Charging voltage range: 42.6V–43.8V

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: 42.6V–43.8V
• Float/storage voltage: 39.9V–40.2V
• Maximum charge current: 100A
• Charging temperature: 0°C to +55°C

Environmental Specifications:

• Operating temperature: -20°C to +60°C
• Charging temperature: 0°C to +55°C
• Storage temperature: Not specified (typically -20°C to +60°C)
• Protection rating: Not specified (confirm IP rating for marine use)

Configuration Options:

• Parallel: Up to 4 units (400Ah total capacity)
• Series: 1 unit only (no series stacking to higher voltages)

Physical Specifications:

• Dimensions: 535mm (L) × 190mm (W) × 220mm (H)
• Weight: 27kg
• Terminal type: Not specified (confirm connection type)
• Housing: Marine-grade construction

Protection Features:

• Over-voltage protection
• Under-voltage protection (30V cutoff)
• Over-current protection
• Over-temperature protection
• Short-circuit protection
• Cell balancing

Warranty:

• 5 years manufacturer warranty

Compatible With / Goes Well With

• 36V marine battery chargers with lithium profiles (42.6V–43.8V)
• High-output marine alternators with 36V charging systems
• 36V solar arrays with MPPT charge controllers
• 36V electric trolling motors (Minn Kota, MotorGuide, Torqeedo)
• 36V electric pod drives and auxiliary propulsion
• 36V to 240V marine inverters (3000W+ capability)
• Marine navigation systems and electronics
• 36V bow thrusters and electric windlasses (if available)
• Electric propulsion control systems
• Marine battery monitoring systems with 36V support
• Parallel BMS systems for expanded 4-unit banks
• Marine-grade heavy cable (35mm²–50mm² for 100A loads)
• Anderson plugs or marine-grade battery terminals rated for 36V
• Waterproof battery boxes and marine compartments

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

Frequently Asked Questions

What's the advantage of 36V over 24V for marine applications?

36V systems further reduce current draw—a 3000W inverter draws 85A at 36V versus 130A at 24V, allowing even smaller cables and less voltage drop. This is particularly advantageous for electric propulsion where efficiency gains translate directly to extended range. Many modern electric trolling motors and pod drives are optimized for 36V operation, delivering better thrust efficiency and longer runtime than lower-voltage equivalents.

Can I use this battery with my 36V Minn Kota trolling motor?

Yes, this battery is specifically suited for 36V trolling motors from Minn Kota, MotorGuide, and other manufacturers. The 100A discharge capability handles the high current draws of electric propulsion, while the stable lithium voltage maintains consistent thrust throughout the discharge cycle unlike lead-acid voltage sag. Verify your trolling motor's maximum current draw is within 100A continuous rating.

How does 3840Wh compare to traditional lead-acid capacity?

An equivalent lead-acid system providing comparable usable capacity would require three 12V 200Ah batteries wired in series (36V), weighing 80–120kg total versus this single 27kg lithium battery. Lead-acid batteries also suffer voltage sag under load and should only be discharged to 50%, meaning you'd need 200Ah lead-acid to match 100Ah lithium's usable capacity. The lithium advantage is dramatic for 36V systems.

Can I charge this with solar panels?

Yes, using a 36V-compatible MPPT solar charge controller rated for the 42.6V–43.8V charging voltage and up to 100A output (for full-rate charging). Most marine solar installations use 12V or 24V panels in series to achieve the required voltage. Consult a marine solar specialist for proper panel configuration and controller selection for 36V systems.

Why can't this battery be connected in series?

The BMS and construction are designed for single-unit operation or parallel configuration only (up to 4 units). Series connection would create 72V+ systems requiring different BMS coordination and safety considerations. For higher voltages, Baintech offers dedicated high-voltage marine batteries. The 4-unit parallel capability (400Ah at 36V = 15,360Wh) provides massive capacity without series complexity.