Cylindrical Lithium-ion Battery

21700 Series

Product Type:

INR21700-4500mAh 3C
INR21700-4000mAh 5C

Used Medium:

Nickel plated steel shell

Nominal Voltage:

3.6 V

Charging Cut-off Voltage:

4.25V

Discharging Cut-off Voltage:

2.5V/2.75V

Standard Charging:

2.25A/2A

Quick Charging:

Standard Discharging:

0.9A/4A

Maximum Continuous Discharge Current:

13.5A/20A

Max Discharge Current:

22.5A(≤3S)/30A(≤3S)

Internal impedance:

≤18mΩ

Battery weight:

Approx.69g

Storage temperature range and outer packing:

Less than 1 months:-20-35℃
Less than 6 months:-10-35℃
Less than 1 year:0-30℃

Operation temperature:

Charge 0 to 50℃
Discharge: -20~ 75℃

Warning:

1. Don't leave battery near a heat source such as fire and heater;
2. Forbid to short-circiut, over-charge and over-discharge batteries;
3. Forbid to immerse battery in water or seawater;
4. Forbid to reassemble or refit the battery;
5. Forbid to touch electrolyte leakage from battery directly;
6. Keep battery out of reach of children;
7. Forbid to transport or store battery together with metal objects such as hairpins, necklaces, etc;

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Introduction

The INR21700 series delivers high energy density, excellent stability, and reliable safety for power and storage applications.
INR21700-4000mAh 5C: High-power type with up to 5C discharge, low internal resistance, and strong voltage stability. Ideal for power tools, e-bikes, and robotics, ensuring efficient energy output and long cycle life.
INR21700-4500mAh 3C: Energy type with high capacity and long runtime, optimized for solar storage, backup systems, and portable power.
Both models feature robust cylindrical shells, superior heat dissipation, and comply with ROHS, UN38.3, MSDS, and CE standards for safe, durable performance.

Details

Model:

21700 lithium battery

Packaging:

Boxed, crated, plastic pallets
Label Design & Customized
MSDS,sGS card, industrial package, Customized package

MOQ:

1000pcs

ShelfLife:

5years

Certification:

CE, ROHS, MSDS, SGS, UN38.3, Non-Restricted Transport Report for Land/Sea/Air Freight

Customization:

OEM/ODM+Deep customization

Delivery time

SAMPLE

1~2 days for exiting brands for sample

OEM SAMPLES

5~7 days for OEM samples

AFTER CONFIRMATION

25 days after confirming order

Qualifications

Advantages

Advantages of cylindrical lithium battery

Cylindrical lithium batteries, including popular models 18650, 21700, and 32700, are widely used in energy storage systems and power applications such as electric vehicles, e-bikes, and industrial equipment. Many suppliers in the market face common issues, including overstated capacity, poor consistency between batches, limited discharge stability, and slow delivery. These problems can severely affect system reliability, operational safety, and brand reputation for global customers.

Advantages of cylindrical lithium battery

Our cylindrical lithium batteries are engineered to overcome these challenges. Energy storage batteries provide high cycle life, low self-discharge, and stable performance, ensuring long-term, reliable power for residential, commercial, and industrial energy systems. Power-type batteries deliver high discharge currents, excellent thermal stability, and robust mechanical strength, meeting the demanding requirements of electric mobility and high-drain equipment. With advanced production lines, strict quality control, and verified capacity data, we guarantee true capacity, consistent performance, large-scale production, and fast delivery. Our 18650, 21700, and 32700 batteries are ready to support global OEM and ODM customers with dependable energy solutions and long-term market competitiveness.