48V 300Ah 15KWH Lithium Battery For Outboard Motors, Electric Boats, Tenders With Aluminum Battery Case, Remote LCD Monitoring And IP67
Bonnen Battery’s 48V 300Ah 15KWH Lithium Battery for Outboard Motors, Electric Boats, and Tenders. Encased in durable aluminum, it ensures longevity in marine environments. Designed for electric boat manufacturers and project managers, it offers good integration with its robust capacity, Remote LCD Monitoring, and IP67 rating for reliability in challenging conditions. The pinnacle of innovation, Bonnen Battery’s solution promises unparalleled performance for the electrified marine industry.
Free Custom Design
24/7 Engineer Support Services
Certification: Compliance with MSDS, UN38.3, CE, CB, IEC 62619, UL
Product Features
| No. | Item Name | Basic parameter |
| 1 | Voltage Range | 51.2 |
| 2 | Battery System Whole Energy (KWH) | Rated：15.36kWh |
| 3 | Battery System Whole Capacity(Ah) | Rated ：300Ah |
| 4 | Battery system Working Temperature | Discharge -20~55℃，Charge -0~55℃ |
| 5 | Battery system Surrounding environment relative humidity | 5%~95% |
| 6 | Battery system storage Temperature | -20～25℃(3-6 Month，50%SOC) |
| -20～45℃(1-3 Month，50%SOC) | ||
| -20～60℃(≤1 Month，50%SOC) | ||
| 7 | Battery system Max. charging current | 100A |
| 8 | Battery system standard discharging current | 200A |
| 9 | Battery system instant discharging current (Max.) | 500A |
| 10 | Cooling system | Air Cool |
| 11 | IP grade | IP67 |
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Easier system planning
51.2V system, 300Ah capacity, and 15.36kWh energy make it easier to match the battery to motor and runtime targets.
Less risk in marine use
IP67 protection helps reduce risk from water and dust exposure in real boating conditions.
Faster project turnaround
Fast charging support can reduce downtime between test runs, demos, or daily trips.
Better installation flexibility
The compact layout and custom dimension option help the pack fit different hull spaces.
More stable daily operation
The BMS supports safer charging and discharging, which helps keep the system more stable over time.
Easier status checks
Remote LCD monitoring makes battery checks simpler for operators and maintenance teams.
Lower maintenance load
The product page describes the battery as maintenance-free, which is a major plus for fleet and project teams.
Better procurement confidence
The listed compliance set, including MSDS, UN38.3, CE, CB, IEC 62619, and UL, gives project managers a stronger base for sourcing and review.
Our lithium solutions are versatile enough for almost any water-based project:
Commercial Fishing Boats: Provides consistent trolling power for 12+ hours without the “voltage sag” common in old batteries.
Electric Sightseeing Ferries: Perfect for daily high-utilization routes where fast charging and deep discharge cycles are required.
Luxury Yachts: Functions as a reliable silent power bank for house loads and backup propulsion.
Research Vessels: Powers sensitive electronic equipment with stable voltage while minimizing hull weight for better fuel efficiency.
Rental Fleets: The 10-year lifespan reduces the “total cost of ownership” for boat rental businesses.
1. How long will a 48V 300Ah lithium battery run my outboard motor?
Basically, it depends on your motor’s wattage. For a 5kW motor at cruise speed, you can expect approx 4-6 hours of continuous runtime.
2. Can I use a standard charger for my lithium marine battery?
No, you shouldn’t. Lithium needs a specific CC/CV charging profile. Using an old lead-acid charger can damage the BMS or shorten the battery life.
3. Is 300Ah enough for an electric boat conversion?
For most small to mid-sized electric boats, 300Ah at 48V is the “sweet spot” for balancing weight and a full day of recreational use.
4. What’s the difference between LiFePO4 and standard Lithium-ion for boats?
LiFePO4 is much more stable. It handles high heat better and won’t go into “thermal runaway,” making it the safest choice for marine environments.
5. How much weight can I save by switching my boat to Bonnen lithium?
A typical 48V 300Ah lead-acid bank weighs around 400kg. Our lithium version is approx 130kg. That’s a 270kg saving!
6. Do these batteries work in cold weather?
Yes, they work down to -20°C, but we recommend our “self-heating” option if you plan on charging them in freezing temperatures.
7. Can I connect two 48V 300Ah batteries in parallel?
Absolutely. You can parallel them to get 600Ah or more if you need extended range for commercial projects.
8. Is the Bonnen 48V battery waterproof?
Yes, our marine series features an IP65 or IP67 rated enclosure, meaning it’s protected against salt spray and brief submersion.
9. How do I monitor the battery level while on the water?
You can use a Bluetooth app on your phone or a dedicated dash-mounted display that talks to the battery’s BMS via RS485 or CANbus.
10. What is the lifespan of a lithium battery for outboard motors?
With proper care, you’ll get 10+ years. We rate our cells for more than 4,000 cycles before they hit 80% capacity.
11. Does Bonnen Battery ship internationally to the US and Europe?
Yes, we are an export manufacturer. We handle the dangerous goods (DG) shipping paperwork to ensure it reaches your warehouse safely.
12. Can these batteries handle the vibration of high-speed boats?
Specifically designed for it! Our internal structure is reinforced to withstand constant sea pounding and heavy vibrations.
13. What happens if the battery gets overcharged?
The built-in Smart BMS automatically shuts off the charging path to protect the cells. It’s a fail-safe system.
14. Are lithium batteries for boats environmentally friendly?
Yes, they are 100% lead-free and acid-free. Plus, their long life means less waste in landfills compared to replacing lead-acid every 2 years.
15. Can I power my boat’s AC and electronics from the same battery?
Yes, using a DC-DC converter or an inverter, the 48V 300Ah bank can easily run your GPS, lights, and even a small AC unit.
16. Why is the 48V 300Ah model better than 12V batteries in series?
A single 48V unit is much more efficient. It reduces wiring complexity, minimizes points of failure, and allows the BMS to balance all cells perfectly.
