High Capacity 3.7V 20Ah 21700 Battery Pack
For ventilators, infusion pumps, and handheld imaging systems, CM Batteries’ ultra-compact 21700 lithium-ion pack delivers high efficiency and compact dimensions. Built with 4 high-performance 21700 cells in a 1S4P configuration, this pack delivers exceptional energy density and consistent output for portable medical applications where size, weight, and reliability matter.
Key features：
- Combination: 1S4P,made of 4pcs 21700 li ion rechargable cells
- Longer cycles: Cap(800th)/Cap(Av10)≥80%
- Built-in Safety Protection: Includes overcharge, over-discharge, overcurrent, and temperature protections.
- Fuel gauge for battery pack
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 3.7V | 3.7V/Cell |
| 2 | Nominal Capacity | 20Ah | @0.2C |
| 3 | Minimum Capacity | 19.6Ah | |
| 4 | Shipment Voltage | / | |
| 5 | Initial Internal Impedance | ≤100mΩ | AC 1KHZ |
| 6 | Standard Charge Voltage | 4.2V | 4.2V/Cell |
| 7 | Standard Charge Current | 10A | |
| 8 | Max. Charge Current | 4A | |
| 9 | Standard Discharge Current | 20A | |
| 10 | Max. Discharge Current | 50A | |
| 11 | Burst Discharge Current | 60A | ≤1000ms |
| 12 | Discharge Cut-off Voltage | 2.7V | 2.7V/Cell |
| 13 | Cycle Life | ≥800cycles | 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 0.4 | kg |
3.7V 20Ah 21700 Li-ion Battery Pack FAQs
Can I replace my existing 18650 battery system with this 21700 pack?
Yes—if your system can accommodate the slightly larger dimensions. We can support customers with a custom housing, connector, and fitment service to help transition from 18650 to 21700 without redesigning the whole system.
Can I customize this battery pack (e.g., 1S2P, 1S4P, BMS, connectors)?
Of course. In order to match your product design, we allow OEM/ODM customization for different configurations, wire length, connections, labels, and housing materials.
Do you provide testing and certification services?
CM Batteries can help with certifications like UN38.3, IEC62133, and others. Testing reports and MSDS are also accessible.
Is it possible to produce samples or in small quantities?
Yes. We provide a flexible MOQ, which includes small-batch customization and sample orders for prototype 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.
