48V 21Ah 13S7P 18650 Li-ion Battery Pack for Small Inspection Robots
As small inspection robots are increasingly deployed in challenging environments—such as power plants, industrial facilities, underground pipelines, and security patrol routes—there is a growing demand for voltage platforms that offer stability, long runtime, compact design, and exceptional reliability.
CMB has engineered a 48V 21Ah lithium-ion battery pack utilizing a 13S7P 18650 cell configuration. This solution serves as a direct replacement for traditional lead-acid systems, enabling inspection robot manufacturers to achieve extended operation time, reduced system weight, and improved lifecycle cost control—all while maintaining full compatibility with standard 48V DC controllers.
Key features：
- Utilizes 91 pcs of high-quality 3.7V 18650 lithium-ion cells arranged in a 13S7P architecture.
- Designed on a stable 48V platform, enabling seamless integration with mainstream controllers and straightforward replacement of legacy lead-acid batteries.
- Enable a compact enclosure with a maximum size of 259 × 70 × 149 mm and an approximate weight of 4.4 kg, significantly lighter than equivalent lead-acid solutions.
- Supports charging from 0 to 45°C and discharging from -20 to 60°C.
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 48.1V | 3.7V/Cell |
| 2 | Nominal Capacity | 21Ah | @0.2C |
| 3 | Minimum Capacity | 20Ah | |
| 4 | Shipment Voltage | / | |
| 5 | Initial Internal Impedance | ≤200mΩ | AC 1KHZ |
| 6 | Standard Charge Voltage | 54.6V | 4.2V/Cell |
| 7 | Standard Charge Current | 4.2A | |
| 8 | Max. Charge Current | 21A | |
| 9 | Standard Discharge Current | 4.2A | |
| 10 | Max. Discharge Current | 31.5A | |
| 11 | Burst Discharge Current | 63A | ≤5s |
| 12 | Discharge Cut-off Voltage | 36.4V | 2.8V/Cell |
| 13 | Cycle Life | ≥700 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 4.4 | kg |
| 18 | Special Request |
13S7P 48V 21Ah 18650 Battery Pack FAQs
How does the battery handle operation in enclosed or poorly ventilated environments?
The 48v 21ah battery system is designed to use energy efficiently and make heat in a controlled way when the currents used are normal. This means it can be used for robots that need to work in tight areas like tunnels, cabinets, pipelines, or indoor factories.
Is the built-in BMS suitable for intelligent robot applications?
Yes.The battery pack includes a fully functional BMS designed for intelligent equipment, providing core protection and operational safeguards required in robotic systems.
Will the battery work reliably with existing 48V robot controllers?
The battery is built on a stable 13S (48V-class) architecture, which aligns with mainstream 48V DC controllers used in inspection robots.
Can you provide the battery with certifications required for robots?
Yes. We provide UN38.3 test reports for shipping compliance, and can also assist with IEC62133 or UL2054 certification processes based on your project needs. Certification execution is coordinated together with your final product testing.
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.
