4S6P 14.8V 18650 18Ah Li Ion Battery Pack for Underwater Drone
Summary of 14.8V 18650 18Ah Li Ion Battery
The 4S6P 14.8V 18650 18Ah Lithium-ion Battery Pack is a high-capacity power solution specifically engineered for underwater drones (ROVs) and marine equipment requiring high discharge current and long runtime. Built with pure NCM (Nickel Cobalt Manganese) lithium cells, it offers exceptionally high energy density, stable output, and superior consistency. With 18Ah capacity, 5C (90A) continuous discharge, and excellent temperature adaptability, it’s designed to deliver powerful, efficient, and reliable energy even in harsh underwater environments.
18650 14.8V 4S6P Battery Parameters
Battery Model: 18650 4S6P
Battery Type: Lithium-ion Batteries
Nominal Voltage: 14.8V
Charge Voltage: 16.8V
Cut-off Voltage: 10.8V
Nominal Capacity: 18Ah
Minimum Capacity: 17.6Ah
Max Continuous Discharge Current: 5C 90A
Peak Discharge Current: 10C 180A
Max Charge Current: 20A
Cycle Life: ≥500 Cycles @80% DOD
Weight: 1155g
Connector: XT90 & JST-XH & NTC
Size: Φ74.5*147mm
Charging Temperature: 0°C to 50°C
Operating Temperature: -20°C to 65°C
Storage Temperature:
- -20℃~25℃: 12 months
- -20℃~45℃: 3 months
- -20℃~60 ℃: 1 month
Key Features – 14.8V Lithium Battery 18650 18Ah
⚡ High Energy Density with Pure NCM Cells
The battery pack is built with pure NCM lithium-ion chemistry, renowned for its high energy density and stable performance. Compared with mixed or low-grade chemistries, pure ternary material (LiNiMnCoO₂) provides:
✅ Higher energy density (Wh/kg)
🔋 More stable discharge curve
🔧 Improved thermal performance
This ensures maximum efficiency and sustained power delivery for energy-demanding marine and robotic systems.
🔋 Massive 18Ah Capacity for Extended Operation
Equipped with 18,000mAh (18Ah) capacity, this pack provides long endurance for underwater drones, inspection ROVs, or AUV systems.
You can expect:
⏱️ Longer dive times and operation cycles
⚙️ Reduced recharging frequency
🔋 Consistent runtime performance even under heavy load
It’s ideal for users needing extended power in exploration, filming, or industrial marine applications.
🌡️ Low Internal Resistance, High Efficiency
Each 18650 cell undergoes precision matching during assembly, ensuring the pack maintains:
⚙️ Low internal resistance → minimal heat generation
🔋 High discharge efficiency (>95%)
🔁 Long-term cell consistency and balance
This translates into a cooler, safer, and more efficient battery pack, even when discharging continuously at high current levels.
🔁 Excellent Consistency & Minimal Capacity Difference
The Cestpower 4S6P battery pack is crafted from highly matched cells with minimal capacity deviation (<2%).
This results in:
⚙️ Stable voltage performance
💪 Smaller internal resistance of the finished pack
🔋 Lower overall energy loss
High uniformity means improved pack safety, efficiency, and cycle life, especially for multi-cell parallel configurations like 4S6P.
⚙️ Built-In Balance Charging Line (No Protection Board)
This battery pack does not include a protection BMS, but it features a built-in balance charging wire, which allows cells to charge evenly.
This ensures:
⚡ Voltage balance across all series groups
🧠 Reduced risk of overcharging imbalance
🔋 Improved battery longevity
For optimal performance and safety, always charge using a dedicated balance charger (see notice section below).
💪 5C (90A) Continuous Discharge Capability
Engineered for high-current devices, this pack supports up to 5C (90A) continuous discharge.
That makes it perfect for:
🤿 Underwater ROV propulsion systems
🚤 Marine robotics and submersible vehicles
🔧 Industrial underwater lighting and control systems
The battery maintains a steady voltage output during rapid discharges, ensuring strong thrust power and stable underwater operation.
🌍 Wide Operating Temperature Range (-20°C to +65°C)
Whether used in cold seawater environments or high-temperature applications, this pack offers reliable performance:
❄️ Operates smoothly down to -20°C
🔥 Stable and safe up to +65°C
This wide working range makes it ideal for field missions, offshore research, and ROV deployments in diverse oceanic conditions.
🧩 OEM Customization & Engineering Support
As a professional 18650 lithium battery manufacturer, Cestpower Battery provides complete customization for your specific application:
⚙️ Voltage / capacity / pack layout customization (e.g., 2S–30S, 10Ah–100Ah)
🏷️ OEM label, sleeve, and packaging
🔌 Connector options: XT60, XT90, Anderson, DC, Molex, custom plugs
🧰 Housing or waterproof sealing support for marine applications
🔬 Technical guidance for BMS selection or external protection design
All battery packs undergo strict testing for voltage, IR, and capacity matching, ensuring superior reliability and traceability.
⚠️ Important Notice
Since this battery pack does not include a built-in protection board (BMS), please observe the following:
✅ Always charge using a balanced charger (to ensure equal voltage across cells).
⚠️ Avoid overcharging (>16.8V) or over-discharging (<10.8V).
🔔 It’s recommended to use a voltage alarm or monitoring system during discharge to prevent cell imbalance.
Proper care ensures maximum cycle life, safety, and optimal performance.
🏭 About Cestpower Battery
Cestpower Battery is one of top 20 lithium ion battery manufacturers specializing in high-performance custom battery packs for industrial, marine, and mobility applications.
We focus on:
🔋 Premium-quality 18650 & 21700 cells (as well as other cylindrical cells)
🌍 OEM / ODM services for global clients
🧪 Comprehensive QC system — voltage, IR, and cycle-life tests
🧠 Engineering consultation for BMS and power system integration
📄 Certified to UN38.3, CE, MSDS, and RoHS
Choosing Cestpower means working directly with a factory-level supplier that provides quality assurance, technical expertise, and flexible customization.
❓Frequently Asked Questions (FAQ)
Q1: Does this 4S6P battery pack include a protection BMS?
A: No, it comes without a BMS, but includes a balance charging wire for equalized charging. Always use a balance charger for safety.
Q2: How can I ensure safe operation without a BMS?
A: Use a balanced charger for charging and install a voltage alarm or cutoff device during discharge to prevent over-discharge.
Q3: What applications is it suitable for?
A: It’s ideal for underwater drones (ROVs), AUVs, marine robotics, and portable industrial equipment.
Q4: Can I customize the voltage or capacity?
A: Yes. Cestpower Battery supports full customization — from 2S to 30S configurations, with adjustable capacity, connector type, and labeling.
Q5: What’s the discharge current limit?
A: It supports 5C continuous discharge (90A), making it suitable for high-current propulsion or thruster systems.
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