Better Way INR 21700-40EC Batterie

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Typical parameters

Introduction to application scenarios of different types of products

Nominal voltage: 3.7V

Capacity type – widely used in new energy vehicles or electric two wheeled vehicles and other means of transportation. Advantages: high capacity, strong endurance and long cycle life.

Nominal capacity:4000mAh@0.2C

Maximum continuous discharge current:3C-12000mA

Recommended ambient temperature for cell charging and discharging: 0~45 ℃ during charging and -20~60 ℃ during discharging

Internal resistance: ≤ 20m Ω

Height: ≤71.2mm

Outer diameter:≤21.85mm
Weight: 70±2g

Cycle life: normal atmospheric temperature25℃ 4.2V-2.75V +0.5C/-1C 600 cycles 80%

Safety performance: Meet gb31241-2014, gb/t36972-2018, ul1642 and other standards

The meaning of 21700 battery usually refers to a cylindrical battery with an outer diameter of 21mm and a height of 70.0mm. Now companies in Korea, China, the United States and other countries are using this model. At present, there are two popular 21700 batteries on sale, namely 4200mah (21700 lithium battery) and 3750mah (21700 lithium battery). 5000mAh (21700 lithium battery) with larger capacity will be launched soon.


The user must have appropriate understanding of lithium ion batteries before purchase. Use caution when working with and using lithium ion batteries as they are very sensitive to charging characteristics and may explode, burn, or cause a fire if misused or mishandled. Always charge in or on a fire-proof surface. Never leave batteries charging unattended. This battery is sold for the use of system integrations with proper protection circuitry or battery packs with a battery management system or PCB (circuit board/module). Buyer is responsible for any damage or injury caused by misuse or mishandling lithium ion batteries and chargers. Charge only with a smart charger designed for this specific type of lithium ion battery.

  • Misusing or mishandling lithium ion batteries can pose a SERIOUS RISK of personal injury, property damage, or death
  • ONLY use with proper protection circuitry
  • ONLY use within manufacturer specification
  • DO NOT store loose in pocket, purse, etc. – always use a protective case
  • KEEP AWAY from metal objects to prevent short circuiting
  • DO NOT short circuit
  • DO NOT use if wrapper or insulator is damaged or torn
  • DO NOT use if damaged in any way
  • DO NOT overcharge or over-discharge
  • DO NOT modify, disassemble, puncture, cut, crush, or incinerate
  • DO NOT expose to liquids or high temperatures
  • DO NOT solder
  • User must be familiar with handling lithium ion batteries before purchase
  • Usage of batteries is AT YOUR OWN RISK

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