43.2V 4Ah Underwater Equipment Lithium Battery Pack
Engineered to withstand extreme deep-water pressure, low temperatures, and corrosive environments, this 12S1P 43.2V 4Ah lithium battery pack is designed with a focus on safety, superior sealing, and high energy density. It delivers reliable, low-maintenance power for underwater equipment, ensuring durable and stable performance even under the most demanding conditions.
Key features：
- IP68 Waterproof Design: Fully sealed against water ingress, ensuring long-term safe and reliable operation even in prolonged underwater applications.
- High-Capacity 21700-P42A Cells: This lightweight 12S1P configuration delivers 43.2V output, offering extended runtime and high-performance power.
- Wide Operating Temperature Range (–20°C to 55°C): Maintains stable performance in cold underwater environments with minimal capacity loss and no unexpected shutdowns.
- Safe Li-ion Chemistry + BMS Protection: Integrated BMS guards against overcharging, overcurrent, overheating, and other potential faults.
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 43.2V | 3.6V/Cell |
| 2 | Nominal Capacity | 4Ah | @0.2C |
| 3 | Minimum Capacity | ≥3.8Ah | |
| 4 | Shipment Voltage | / | |
| 5 | Initial Internal Impedance | ≤200mΩ | AC 1KHZ |
| 6 | Standard Charge Voltage | 50.4V | 4.2V/Cell |
| 7 | Standard Charge Current | 2A | 0.5C |
| 8 | Max. Charge Current | 4A | 1C |
| 9 | Standard Discharge Current | 4A | 1C |
| 10 | Max. Discharge Current | 10A | |
| 11 | Burst Discharge Current | ≤15A | ≤20ms |
| 12 | Discharge Cut-off Voltage | 30.0V | 2.5V/Cell |
| 13 | Cycle Life | ≥500 cycles | Retention: ≥80% |
| 14 | Charge Temperature | 0°C~+45°C | Standard Charge |
| 15 | Discharge Temperature | -20°C ~+55°C | Standard Discharge |
| 16 | Storage Temperature | -20°C~ +40°C | ≤1 Year |
| -20°C~ +25°C | |||
| 17 | Weight | About 1.15 | kg |
43.2V 4Ah Lithium 21700 battery pack FAQs
How reliable is it in underwater use?
Its IP68-rated waterproof design is rigorously tested and proven in real-world underwater applications, guaranteeing leak-free and failure-free operation.
How do you ensure safety?
Each pack has multiple protection layers—short circuit, overcharge, over-discharge, overcurrent, and temperature control—plus strict quality testing.
Do you provide battery pack certifications?
We support UN38.3, MSDS, CE, RoHS, and can help with additional testing if required.
Can this pack be customized for my device?
Yes. We can adjust size, connectors, BMS settings, and even communication protocols like CAN.
Can you supply samples for testing before a bulk order?
Yes, we offer samples. Testing in your application is recommended to ensure compatibility before mass production.
Tailored Customization
Our design team can create custom battery designs for just about any device or machine.
Timely Delivery
Our efficient production and distribution process gets your product delivered in a timely manner.
Quality Guarantee
We stand by our products and guarantee you’ll be happy with your purchase.
