Marine LiFePO₄ Batteries – Deep Cycle & Starting for Boats, Yachts, Trolling Motors

Premium Marine LiFePO₄ Batteries

– Power for Trolling Motors, Electronics & Engine Starting

IP67 waterproof, vibration-resistant, starting + deep cycle hybrid available.

Trusted by commercial fishing vessels, sailboats, yachts, and electric propulsion systems.

Marine Lithium Batteries

Polinovel, a top Chinese lithium battery manufacturer, produces marine lithium batteries with a wide variety of capacities, such as 50Ah, 105Ah, 160Ah, 210Ah, 304Ah, 460Ah, 525Ah, etc., that suit the needs of 12V, 24V, 36V, and other marine voltage systems. Our deep cycle lithium iron phosphate batteries offer great safety as well as longer run time for marine applications, like trolling motors, sailboats, kayaks, fishing boats, bass boats, catamarans, etc.

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Why Boat Owners And Builders Switch From Lead‑acid To Lithium？

1. Corrosion & moisture Saltwater kills terminals and seals.

2. Weak engine starting Deep-cycle batteries can't crank engines.

3. Slow recharging 6–8 hours at dock kills work time.

4. Heavy weight Extra fuel burn & less payload.

5. Short life Replace lead-acid every 1–2 years.

6. No battery insight No warning before failure offshore.

→ IP67 waterproof & anti-corrosion housing.

→ 10C peak discharge – starting + deep cycle in one.

→ 3x faster charging, back on water in 2 hours.

→ 70% lighter, improve fuel efficiency 5–10%.

→ Upto 6,000 cycles, 10+ years TCO.

→ Bluetooth real-time monitoring on phone.

LiFePO₄ vs Lead-Acid – The Marine Comparison

Lighter, stronger, longer – engineered for saltwater, vibration, and extended time on the water.

Core value exhibition area

Comparison	Lead‑Acid	LiFePO₄ (Polinovel)
Usable Capacity	~50% (avoid deep discharge)	95% (100% DoD)
Cycle Life	200–500 cycles	3,000–6,000 cycles
Weight (100Ah)	28–35 kg	10–12 kg (60‑70% lighter)
Charge Time (0‑100%)	6–10 hours	2–4 hours (3x faster)
Waterproof Rating	IP22 (drip‑resistant)	IP67 (1m submersion, 30 min)
Vibration Resistance	Moderate (plates can crack)	Drop tested
Engine Starting	Separate starting battery needed	Dual‑purpose (start + deep cycle, 10C peak)
Smart Monitoring	None	Bluetooth

Need a battery that fits your vessel‘s exact specs?

Talk to our marine engineer →

Marine Engineered Features – What They Deliver for You

Not just spec sheets – here‘s what each feature means for your daily operations.

Bluetooth Smart Monitoring – Know Your Power From the helm

Check state of charge, voltage, and temperature from your helm or phone – without opening a single battery hatch.

Reset Button – Never Get Stranded on Water

If the battery enters sleep mode due to deep discharge, press RESET to wake it up and allow charging – no tools, no return to shore.

Override Button – Emergency Power When You Need It Most

After low-voltage cutoff, press OVERRIDE to access remaining reserved energy – enough to start your engine or send a distress signal.

Protection Mode – Safe Storage and Maintenance

Remotely disconnect discharge via Bluetooth when the vessel is in storage. Prevents parasitic drain and extends battery life during off-season.

IP67 Waterproof – Withstands Marine Environment

Fully sealed to IP67 – withstands 1m immersion for 30 minutes. Safe for engine bays, deck lockers, or bilge areas.

Shock Resistance – Handles Rough Seas

Engineered to withstand vibration. Survives pounding waves, helm slams, and continuous running in rough seas.

Learn more about this feature

Choosing the Right Marine LiFePO₄ Battery – A 3‑Step Technical Guide

Select the correct voltage, capacity, and battery type for your vessel – whether you run a single outboard, a sailing yacht, or a commercial workboat.

Step 1 – Identify Your Hull & Daily Electrical Load

Start by understanding your boat type and the key equipment you power.

This helps determine both mechanical requirements (vibration, space) and electrical demand.

Hull / Application	Typical Onboard Loads (12V reference)
Bass boat / small fishing boat	Trolling motor (30-50A), fish finder (1-2A), livewell pump (3-5A)
Sailboat (30-45 ft)	Autopilot (2-4A), navigation instruments (2A), fridge (5-7A), LED lights (2-5A)
Yacht / cabin cruiser	Multiple fridges, air conditioning (via inverter), entertainment system, bow thruster
Workboat / commercial fishing	Winches (high intermittent), radar, sonar, LED floodlights (10-20A)
Electric propulsion boat	48V or higher system - contact our engineers for a dedicated solution

Not sure about your total load? Proceed to Step 3 – we provide a simple formula and example to calculate your exact daily amp‑hour (Ah) needs.

Step 2 – Choose Battery Type: Starting, Deep Cycle, or Dual‑Purpose

Use the decision flow below to select the right battery family. Each option links to our corresponding product series.

Do you start engine frequently?
→ No, only trolling motors or electronics → Pure Deep Cycle → BL Series (high capacity, long runtime)
→ Yes, and I prefer a separate cranking battery → High‑C Starting Battery → DUAL Series (high discharge rate)

→ Yes, but I want ONE battery for both starting and house loads → Dual‑Purpose (Starting + Deep Cycle) → DUAL Series

“For most recreational boats under 40 ft, one DUAL Series battery replaces both a starting battery and a deep‑cycle house bank – saving space, weight, and cost.”

Step 3 – Calculate Your Required Capacity (Ah)

Use this formula to estimate how many amp‑hours you need per day, then add safety margin.
Daily energy consumption (Ah) = Σ (Device Current in Amps × Daily Running Hours)
Recommended battery capacity = Daily Ah × 1.2 ~ 1.5

"The multiplier keeps depth of discharge (DoD) at 80% or less, maximising LiFePO₄ cycle life (4,000‑6,000 cycles)."

Example Calculation - Bass Boat
Device	Current	Hours/day	Ah/day
Trolling motor (variable speed)	40 (average)	3	120
Fish finder / sonar	2	6	12
Livewell pump	4	5	20
LED navigation lights	2	2	4
Total	156Ah
Recommended capacity (x1.3)	202.8Ah → Choose 200Ah or 2 x 100Ah in parallel

Quick Reference for Common Setups
Daily Load (estimated	Recommended LiFePO4 Capacity
50-80Ah	100Ah
80-120Ah	150Ah
120-170Ah	200Ah
170-230Ah	300Ah
230-300Ah	400Ah (2x200Ah parallel)

Real Marine Case Studies – Trusted by Boat Builders & Fleet Owners

See how boat owners and manufacturers are upgrading to lithium.

Bass Boat Owner

Key Benefit: Runtime: 0.5 day → 8+ hours | Bluetooth monitoring without opening deck

“My old lead-acid battery barely lasted half a day running my trolling motor and fish finder. I switched to Polinovel‘s 105Ah LiFePO₄ – now I get 8+ hours on the water. The Bluetooth app lets me check state of charge without opening the deck hatch. Best upgrade I’ve made.”
— Mike, bass boat owner

12V 105Ah | Trolling + fish finder

Sailboat Circumnavigators

Key Benefit:

2 days autonomy (fridge + nav + lights) | IP67 bilge installation

“We live aboard our sailboat six months a year. Two Polinovel 200Ah batteries run our fridge, navigation, lights, and electronics for two full days – no solar needed. IP67 means we installed them in the bilge without a second thought.”
— Sarah & Tom, circumnavigators

24V 200Ah (2x 12V) | Cruising liveaboard

Cold Weather User – Canadian Rockies Winter Camping

Key Benefit: Charges at -30°C | Self-heating activates with charger

“Camping in the Canadian Rockies in winter, standard lithium batteries shut down below -10°C. Polinovel‘s self-heating version solved it – plug in the charger in the morning, it warms up and starts charging within half an hour. No more frozen power.”
— Dave, Canadian RV enthusiast

12V 200Ah + Self-Heating | Winter package

Custom Marine Battery Solutions for Boat Builders & Fleet Operators

Polinovel partners with boat manufacturers, dealers, and commercial fleet operators worldwide. Our OEM services include:

✔ Custom battery dimensions to fit tight bilge compartments
✔ OEM branding on battery casing and iPolinovel app
✔ UL/CE certified solutions for target markets
✔ Volume pricing for fleet and production-scale orders

Partner with Polinovel OEM

Marine LiFePO₄ FAQ – Technical Answers for Boat Builders & Fleet Operators

Straight answers to the most common technical questions from marine professionals.

Request a Marine LiFePO₄ Quote

OEM & Fleet Projects Welcome

Bluetooth Smart Monitoring – Know Your Power From the helm

Reset Button – Never Get Stranded on Water

Override Button – Emergency Power When You Need It Most

Protection Mode – Safe Storage and Maintenance

IP67 Waterproof – Withstands Marine Environment

Shock Resistance – Handles Rough Seas

Bass Boat Owner

Sailboat Circumnavigators

Cold Weather User – Canadian Rockies Winter Camping

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