25.9V 21Ah Li ion 18650 Battery Pack for Scuba Diving Light
Engineered for professional underwater illumination, our custom 7S6P 18650 battery pack delivers reliable, long-lasting power in a rugged, waterproof design. Built to withstand demanding dive environments, the pack features an IP67-rated waterproof enclosure and a sealed waterproof connector — all provided with no additional tooling fees, helping you move from design to deployment faster and more cost-effectively.
Leveraging CMB’s deep expertise in battery solutions for diving equipment, our engineering team ensures every pack is optimized for performance, safety, and durability. From cell selection and thermal design to robust BMS integration, we focus on delivering a power system you can trust — dive after dive.
Key features：
- High-Capacity 7S6P Configuration,built with 42 premium LG MJ1 cells
- Featuring an IP67-rated enclosure and sealed connectors
- Full submersion protection up to 6 meters for 2 hours
- Fully tailored to fit specific dimensional and shape requirements
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 25.9V | 3.7V/cell |
| 2 | Nominal Capacity | 21Ah | @0.2C |
| 3 | Minimum Capacity | 20.1Ah | / |
| 4 | Shipment Voltage | / | / |
| 5 | Initial Internal Impedance | ≤120mΩ | AC 1KHZ |
| 6 | Standard Charge Voltage | 29.4V | 4.2V/Cell |
| 7 | Standard Charge Current | 10A | |
| 8 | Max. Charge Current | 20A | |
| 9 | Standard Discharge Current | 10A | |
| 10 | Max. Discharge Current | 20A | / |
| 11 | Burst Discharge Current | 35A | ≤5s |
| 12 | Discharge Cut-off Voltage | 18.9V | 2.7V/cell |
| 13 | Cycle Life | ≥500 cycles | Retention: ≥80% |
| 14 | Charge Temperature | 0°C~45°C | Standard Charge |
| 15 | Discharge Temperature | -20°C ~+60°C | Standard Discharge |
| 16 | Storage Temperature | -20°C~45°C | ≤3 Months |
| -20°C~25°C | ≤1 Year | ||
| 17 | Weight | About 2.93 | kg |
| 18 | Special Request | / | / |
7S6P 25.9V 21Ah 18650 Battery Pack FAQs
What applications is the 21Ah capacity best suited for?
With high capacity and stable discharge, it is ideal for extended-use applications such as:
Industrial automation equipment
Outdoor monitoring & security systems
Mobile inspection robots
High-power handheld devices and portable stations
Does the BMS include cell balancing?
Yes. We offer both active and passive balancing options to maintain voltage consistency across cells, extending overall pack cycle life and enhancing safety under varied load conditions.
What is the continuous discharge current of this battery pack?
The standard configuration supports 10–20A continuous discharge, with options to customize higher currents based on your specific power requirements and thermal design.
Can this battery pack achieve a higher waterproof rating?
Yes, absolutely. We can design enclosures and seals to meet higher IP standards (e.g., IP68). To determine the best solution, we will evaluate your specific project needs, environmental conditions, and required submersion depth or duration.
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.
