High Temperature 3.7V 4000mAh 21700 Battery Pack
Standard lithium batteries falter under high temperatures, suffering from rapid power loss, swelling, or even failure. For compact devices requiring high peak power, traditional batteries can’t deliver both size and performance. CM Batteries’ High-Temperature 3.7V 4000mAh 21700 Battery Pack is engineered for industrial applications, operating in environments up to 75°C.
Key features：
- 10C discharge rate
- Operating temperature
- Charge: 0℃＜ T ≤ 50℃
- Discharge: -20℃～75℃
- Low internal resistance
- Integrated with PCB protection
| No. | Item | Parameter | Remark |
|---|---|---|---|
| 1 | Nominal Voltage | 3.7V | 3.7V/Cell |
| 2 | Nominal Capacity | 4Ah | @0.2C |
| 3 | Minimum Capacity | 3.9Ah | |
| 4 | Shipment Voltage | / | |
| 5 | Initial Internal Impedance | ≤130mΩ | AC 1KHZ |
| 6 | Standard Charge Voltage | 4.2V | 4.2V/Cell |
| 7 | Standard Charge Current | 2A | |
| 8 | Max. Charge Current | 4A | |
| 9 | Standard Discharge Current | 2A | |
| 10 | Max. Discharge Current | 40A | |
| 11 | Burst Discharge Current | 80A | ≤100ms |
| 12 | Discharge Cut-off Voltage | 2.7V | 2.7V/Cell |
| 13 | Cycle Life | ≥350cycles | Retention: ≥70% |
| 14 | Charge Temperature | 0°C~+50°C | Standard Charge |
| 15 | Discharge Temperature | -20°C ~+75°C | Standard Discharge |
| 16 | Storage Temperature | -20°C~ +45°C | ≤3 months |
| -20°C~ +25°C | ≤1 Year | ||
| 17 | Weight | About 0.15 | kg |
3.7V 4000mAh 21700 Battery Pack FAQs
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.
Can this battery operate in high temperatures?
It is built with temperature-tolerant materials and protection circuitry for safe, sustained use up to 75°C. We recommend full system-level thermal validation.
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.
