Summary of 21700 3000mAh 15C Li Ion 3.7V Battery​

The 3.7V 21700 3000mAh 15C Lithium Ion Battery Cell is a high-performance cylindrical cell designed for applications that demand high power output, excellent thermal stability, and long-term reliability. With an energy density up to 176.19Wh/kg, low internal resistance, and 15C continuous discharge (up to 45A), this cell is ideal for multi-series and multi-parallel battery packs used in power tools, e-mobility, energy storage systems, and industrial equipment.

21700 3000mAh Lithium Battery 3.7V Specification

Model: 21700

Rated capacity: 3000mAh

Energy: 11.1Wh

Energy Density: 176.19Wh/kg

Minimum Capacity: 2950mAh

Rated voltage: 3.7V

Discharge Cut-off Voltage: 2.75V

Charge Cut-off Voltage: 4.2V

Cycle Life: More than 500 cycles

Dimensions: Φ21*70mm

Weight: 63g

Internal Resistance: Less than 18mΩ

Standard Discharge Current: 0.2C (600mA)

Standard Charge Current: 0.2C (600mA)

Max Continuous Discharge Rate: 15C (45A)

Max Continuous Charge Current: 2C (6A)

Charging Temperature: 0 to 45℃;

Discharge Temperature: -20 to 65℃

Storage Temperature:

• -20℃~25℃: 12 months
• -20℃~45℃: 3 months
• -20℃~60 ℃: 1 month

Key Features – 3000mAh 21700 Lithium Ion Battery​

🔥 Ultra-High Energy Density (Up to 172.09Wh/kg)

Optimized electrode materials and advanced cell design deliver more energy in less space, helping manufacturers build lighter, more compact battery packs without sacrificing runtime.

⚙️ 15C Continuous Discharge | Max 45A Output

Designed for high-load scenarios, this 21700 lithium-ion cell supports 15C continuous discharge, providing a stable maximum current of 45A with minimal voltage sag—perfect for power-hungry devices.

🌡️ Low Internal Resistance, Less Heat Generation

Thanks to precision manufacturing and strict cell matching, the cell features low internal resistance, resulting in reduced heat buildup, higher discharge efficiency, and improved safety under continuous operation.

🔗 High Cell Consistency for Battery Pack Integration

Each cell undergoes rigorous testing and sorting to ensure excellent consistency in capacity, voltage, and internal resistance, making it especially suitable for multi-series and multi-parallel battery pack designs.

🔄 Reliable Cycle Life & Stable Performance

Engineered for long-term use, the cell maintains stable output across repeated charge and discharge cycles, supporting demanding applications where reliability and longevity are critical.

🛠️ Customization & OEM Support

Cestpower offer flexible customization services to meet diverse project requirements:

• 🔌 Custom voltage configurations

• 🔋 Tailored capacity options

• ⚡ Adjustable discharge rates (C-rate)

• 🔁 Customized cycle life targets

• 🏷️ Full OEM / private labeling support

Cestpower team works closely with clients to ensure seamless integration into your battery systems.

❓ Frequently Asked Questions (FAQ)

Q1: What does the C stand for on a battery?

Q2: What voltage to charge a 21700 battery?

Q3: What is the cut off voltage for a 21700 battery?

A: The typical cut-off (end-of-discharge) voltage for a 21700 lithium-ion battery is around 2.5V–3.0V per cell, depending on manufacturer’s specification. Cestpower brand 21700 battery cell cut off voltage is 2.75V. Discharging below this voltage can permanently damage the cell and significantly shorten its lifespan.

Q4: Which 21700 battery is best?

Q5: How do I store a 21700 battery?

A: Store a 21700 lithium-ion battery in a cool, dry place at about 40–60% charge to minimize aging. Avoid extreme temperatures, direct sunlight, and fully charged or fully depleted storage for long periods.

Cylindrical Battery Cell List

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