The 21700 lithium battery is a cylindrical lithium-ion battery with a diameter of 21mm and a height of 70mm.
Its size is larger than the traditional 18650 battery, and this design allows for significant improvements in both capacity and discharge performance.
Generally, the typical capacity range for a 21700 lithium battery is between 4000mAh and 5000mAh,
making it particularly effective in applications requiring high energy output.
The nominal voltage of this battery is typically 3.6V or 3.7V, with a charging cut-off voltage of 4.2V and a discharge cut-off voltage of 2.5V.
This voltage range ensures the battery's stability and safety. Furthermore, the maximum discharge current of the 21700 lithium battery is typically between 10A and 30A,
with peak instantaneous discharge capabilities of up to 45A, meeting the demands of high-power devices like power tools and electric vehicles.
Energy density is one of the key indicators of a battery's performance, and the 21700 lithium battery has an energy density of 200-250Wh/kg,
which is about 20% higher than the 18650 battery. This feature means that, for the same weight, the 21700 lithium battery can provide longer endurance,
making it especially crucial for applications that require high efficiency and longevity.
Application Prospects of the 21700 Lithium Battery
Due to its excellent performance, the 21700 lithium battery shows broad application prospects across multiple fields. In the electric vehicle industry,
it has become an important choice for enhancing driving range. The successful implementation of this battery in the Tesla Model 3 has demonstrated its capabilities,
and other automakers are gradually adopting this battery to improve the performance and market competitiveness of their electric vehicles.
In the power tools market, the 21700 lithium battery is highly favored for its high discharge rate and long cycle life.
Whether in drills, angle grinders, or other heavy-duty tools, this battery provides stable and continuous power, meeting the demands of professional users.
| NO. 序号 | Item 项目 | Specifications 规格要求 |
|---|
| 4.1 | Typical Capacity 典型容量 | 48 00mAh (0.2C Discharge 0.2C 放电) |
| 4.2 | Minimum Capacity 最小容量 | 4750mAh (@0.2C Discharge 0.2C 放电) |
| 4.3 | Nominal Voltage 标称电压 | 3.7V |
| 4.4 | Standard Charge 标准充电 | CC/CV, 0.2C5A, 4.20V |
| 4.5 | Standard Discharge 标准放电 | CC, 0.2C5A, 3.00V |
| 4.6 | End-of-charge Voltage 充电截止电压 | 4.20V ± 0.05V |
| 4.7 | End-of-charge Current 充电截止电流 | 0.01C5A (At CV mode) |
| 4.8 | End-of-discharge Voltage 放电截止电压 | 3.00V |
| 4.9 | Charging Time 充电时间 | 7.0 hours (standard charge) 7 小时 |
| 4.10 | Quick Charge Current 快速充电电流 | 2400mA |
| 4.11 | Quick Discharge Current 快速放电电流 | 4800mA |
| 4.12 | Max Discharge Current 最大放电电流 | 7200mA |
| 4.13 | Initial Impedance 初始内阻 | Max: 50mΩ |
| 4.14 | Weight 重量 | Approx (约): 70 ± 1g |
| 4.15 | Operating Temperature 工作温度 | Charging (充电): 0℃ ~ 45℃ Discharging (放电): -20℃ ~ 60℃ |
| 4.16 | Storage Temperature 储存温度 | -5℃ ~ 35℃ |
| 4.17 | Storage Humidity 储存湿度 | ≤ 75%RH |
| 4.18 | Appearance 外观 | Without scratch, distortion, contamination, and leakage (无划痕、变形、污迹、电解液泄露) |
| 4.19 | Standard Environmental Condition 标准环境 | Temperature 温度: 23 ± 5℃ Humidity 湿度: 45-75%RH Atmospheric Pressure 大气压: 86-106 KPA |

EASTAR specializes in high-performance cylindrical lithium batteries, offering reliable and high-quality solutions for various applications. Our products include a wide range of lithium batteries that provide excellent performance and long-lasting power for everything from portable devices to high-power systems. Our Battery Range: 18650 Battery: 800mAh to 3500mAh, with high energy density for devices like flashlights, laptops, and drones. 21700 Battery: 3000mAh to 5000mAh, ideal for power tools, electric vehicles, and high-power applications. 26650 Battery: 3000mAh to 5200mAh, designed for high-drain devices that require long runtimes. 14500 Battery: 600mAh to 1000mAh, similar to AA batteries but with higher voltage, for portable electronics. 16340 Battery: 600mAh to 1000mAh, a rechargeable alternative to CR123A batteries, for small devices. 10440 Battery: 200mAh to 600mAh, similar to AAA batteries, with higher voltage for compact devices.
Comprehensive Product List and Key Features
14500 Model
• Nominal Capacity: 700mAh
• Rated Energy: 2.59Wh
• Max Discharge Current: 700mA
• Dimensions: 14.5mm (D) x 49mm (H)
• Applications: Small electronic devices, LED lighting, portable equipment
18650 Models
• Capacity Range: 800mAh - 3500mAh
• Energy Range: 2.96Wh - 12.95Wh
• Max Discharge Current: 800mA - 10000mA (10A)
• Dimensions: 18.13mm (D) x 65.10mm (H)
• Weight: 27g - 45g
• Applications: Flashlights, power banks, e-bikes, laptops, power tools
21700 Models
• Capacity Range: 3000mAh - 5000mAh
• Energy Range: 12.21Wh - 18.5Wh
• Max Discharge Current: 10000mA - 15000mA (10A-15A)
• Dimensions: 21.13mm (D) x 70.10mm (H)
• Weight: 60g - 70g
• Applications: Electric vehicles, high-drain devices, energy storage systems
26650 Models
• Capacity Range: 5000mAh - 5500mAh
• Energy Range: 18.5Wh - 20.35Wh
• Max Discharge Current: 15000mA (15A)
• Dimensions: 28.18mm (D) x 65.10mm (H)
• Weight: 70g
• Applications: High-capacity power storage, solar energy systems, industrial equipment
Key Features
• High energy density and stable performance
• Wide operating temperature range
• Long cycle life and low self-discharge rate
• Suitable for high-drain and high-capacity applications
| Model | Nominal Voltage (V) | Nominal Capacity (mAh) | Max Discharge Current (mA) | Charging Voltage (V) | Discharge Voltage (V) | Max Diameter (mm) | Max Height (mm) |
|---|
| ICR14500 | 3.7 | 700 | 700 | 4.2 | 2.75 | 14.3 | 49 |
| ICR18650 | 3.7 | 800 | 800 | 4.2 | 2.75 | 18.13 | 65.10 |
| ICR18650 | 3.7 | 1200 | 1200 | 4.2 | 2.75 | 18.13 | 65.10 |
| ICR18650 | 3.7 | 1500 | 1500 | 4.2 | 2.75 | 18.13 | 65.10 |
| ICR18650 | 3.7 | 1800 | 1800 | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM18650 | 3.7 | 2000 | 2000 | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM18650 | 3.7 | 2200 | 2200 | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM18650 | 3.7 | 2600 | 3C | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM18650 | 3.7 | 3200 | 3C | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM18650 | 3.7 | 3400 | 3C | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM18650 | 3.7 | 3500 | 3500 | 4.2 | 2.75 | 18.13 | 65.10 |
| NCM21700 | 3.7 | 3000 | 3000 | 4.2 | 2.75 | 21.13 | 70.10 |
| NCM21700 | 3.7 | 4000 | 4000 | 4.2 | 2.75 | 21.13 | 70.10 |
| NCM21700 | 3.7 | 4500 | 3C | 4.2 | 2.75 | 21.13 | 70.10 |
| NCM21700 | 3.7 | 4800 | 3C | 4.2 | 2.75 | 21.13 | 70.10 |
| NCM21700 | 3.7 | 5000 | 3C | 4.2 | 2.75 | 28.18 | 65.10 |
| NCM26650 | 3.7 | 5500 | 3C | 4.2 | 2.75 | 28.18 | 65.10 |
| NCM26650 | 3.7 | 5500 | 3C | 4.2 | 2.75 | 28.18 | 65.10
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