INR21700-40MF

Product Features:

Ultra-High Discharge Capacity

Instant High Current Output

Low Internal Resistance

High Power Performance

Strong Durability

Application Areas

Perfect for high-demand, high-safety use cases including:

New national standard electric two-wheelers
Electric scooters
Electric motorcycles
Electric mobility vehicles
Other e-transportation and industrial power applications

Explore more use cases in our Industry Applications

Parameter：

Cell's Materials	Phosphate Manganese Iron Lithium Doped with Ternary (30%)
Dimension (mm)	Height: 70.8±0.2mm
Dimension (mm)	Diameter: 21.7±0.15mm
Nominal Voltage (V)	3.6V
Nominal Capacity (Ah) (0.2c)	4000mAh
Internal Resistance (mΩ)	≤22mΩ
Weight	66.2±1g
Max Discharge Rate	5C
Max Charge Rate	1C
Cycle life (DOD 80% 25℃)	Charge: 0.5C, Discharge:3C≥400 cycles Charge: 0.5C, Discharge:1C≥1000 cycles
Operating Temperature(Cell Surface)	Charge: 0~45℃ Discharge: -10~60℃

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Product Differentiation/Why Choose Joinsun:

01

Source Factory

With comprehensive services and quality assurance, employing cutting-edge technology and high-end materials to provide a longer average lifespan.
02

Professional Team and Advanced Production Equipment

A research and development team of over 30 people with 24 related patents. The company covers an area of 100 acres, equipped with 8 advanced coating production lines, 3 fully automated injection lines, 10 sets of fully automatic sheet winding machines, 6 fully automatic integrated welding production lines, etc., meeting the production capacity demand of 20GWh per day, ensuring product efficiency and quality.
03

Sales Network and Services

Jixin Technology has established offices in East China, South China, and an overseas affairs department, with sales networks gradually expanding to cover the Middle East and Southeast Asia regions. Striving to become a leading supplier in the power battery and energy storage lithium battery markets, providing comprehensive service and support.
04

High Cost-Effectiveness

Joinsun products provide high value for their cost.
05

Cost-Effective, Customizable Solutions

OEM support and custom battery pack services with flexible packaging, testing, and support.
06

Certified for Safety & Quality

Our batteries are UL, CE, GB31241-2022, and now EETA certified, ensuring full compliance and reliability.
Visit our Homepage to learn more about JOINSUN’s full product range.

Industrial Packaging That Can Be Customized According to Requirements.

* Warranty Policy: Provide warranty and replacement service within a certain period of time to ensure the interests of customers.

* Important Notes: Please strictly follow the instructions provided in the product manual.

Customer Feedbacks

JOINSUN battery packs a powerful punch. lt has never failed to provide enough energy to keep our devices running smoothly. From our smartphone to my portable speakers, this battery has got it covered.

Jacob

JOINSUN has provided us with customized lithium battery solutions for our energy storage systems. Their batteries are UL and CE certified, ensuring safety and reliability. Fast shipping and great customer support!

John

We needed custom lithium battery packs for our electric bikes, and JOINSUN delivered exactly what we wanted. Their R&D team helped optimize the design, and the production was quick. Definitely our go-to supplier for long-term cooperation!

Sarah

We've been sourcing 18650 and 21700 battery packs from JOINSUN for over a year. The battery quality is excellent, with stable performance, high capacity, and long cycle life. Their team is very professional and responsive. Highly recommended!

Michael

Parameter Table

Materials	Phosphate Manganese Iron Lithium Doped with Ternary (30%)
Dimension (mm)	Height: 70.8±0.2mm
Dimension (mm)	Diameter: 21.7±0.15mm
Nominal Voltage (V)	3.6V
Typical Capacity (Ah) (0.2c)	4000mAh
Internal Resistance (mΩ)	≤22mΩ
Cell Weight	66.2±1g
Max Discharge Rate	5C
Max Charge Rate	1C
Cycle life (100%DOD25℃)	+0.5-3C≥400 cycles +0.5-1C≥1000 cycles
Operating Temperature Range (Cell Surface)	Charge 0-45℃ Discharge -10-60℃