IMREN 21700 3750mAh 40A Battery Review: A Perfect Blend of Performance and Reliability | IMREN Battery

IMREN 21700 3750mAh 40A Battery Review: A Perfect Blend of Performance and Reliability | IMREN Battery

In the competitive world of rechargeable lithium batteries, IMREN stands out as a brand synonymous with quality and innovation. The IMREN 21700 3750mAh 40A battery is one of their standout products, designed to deliver exceptional performance and unmatched reliability. This review will delve into the key features, performance metrics, and overall benefits of this battery, ensuring you have all the information you need to make an informed decision.

Key Specifications:

  • Manufacturer: IMREN
  • Model: 21700-3750-40A
  • Size: Φ=21mm, H=70mm
  • Positive Terminal: Flat Top
  • Nominal Capacity: 3750mAh
  • Nominal Voltage: 3.7V
  • Standard Charge: CCCV, 1.50A, 4.20V±0.05V, 150mA cut-off
  • Standard Discharge: 40A
  • Charging Time: 2-3 hours, 3750mA (1.0C 5rate)
  • Initial Impedance: 13-16mΩ
  • Weight: 55.0g±2g
  • Operating Temperature: Charging: 0℃45℃, Discharging: -20℃60℃
  • Storage Temperature: -20~45℃
  • Storage Humidity: ≤75% RH
  • Warranty: 1 Year

Performance Metrics:

The IMREN 21700 battery boasts a nominal capacity of 3750mAh, providing ample power for a variety of high-drain devices. Whether you're using it in a high-performance flashlight, a vape mod, or any other power-hungry device, this battery ensures a long-lasting and stable power supply. The nominal voltage of 3.7V ensures consistent performance throughout its discharge cycle.

One of the standout features of this battery is its high discharge rate of 40A. This makes it an ideal choice for applications that require a significant power burst. Users can rely on the IMREN 21700 battery to deliver peak performance without the risk of overheating or significant voltage drop.

Efficient and Safe Charging:

The IMREN 21700 battery supports CCCV (Constant Current, Constant Voltage) charging, a method that ensures efficient and safe recharging. The standard charge parameters include a 1.50A charging current and a precise voltage control of 4.20V±0.05V. This approach not only speeds up the charging process but also extends the overall lifespan of the battery.

With a charging time of 2-3 hours, you won't have to wait long to get your devices up and running again. The battery's initial impedance of 13-16mΩ further highlights its efficiency, as lower internal resistance translates to better power transfer and reduced energy loss.

Durability and Design:

Built with durability in mind, the IMREN 21700 battery features a robust construction that can withstand daily wear and tear. Its flat top design ensures compatibility with a wide range of devices, making it a versatile choice for various applications.

The battery is designed to operate efficiently in a wide temperature range, from 0℃ to 45℃ during charging and -20℃ to 60℃ during discharging. This makes it suitable for use in diverse environments, from cold outdoor conditions to hot indoor settings.

User-Friendly Features:

IMREN has equipped this battery with user-friendly features to enhance safety and convenience. The battery includes protection against reverse polarity, overcharge, overcurrent, and short circuits. These safety mechanisms ensure that both the battery and your devices remain protected during use.


The IMREN 21700 3750mAh 40A battery is a powerful and reliable choice for anyone in need of a high-performance lithium battery. Its impressive capacity, high discharge rate, efficient charging, and robust design make it suitable for a wide range of high-drain applications. Whether you're a professional or an enthusiast, this battery delivers the performance and reliability you need.

Invest in the IMREN 21700 battery today and experience the difference in power and reliability. With IMREN's commitment to quality and innovation, you can trust that you're getting a top-notch product designed to meet and exceed your expectations.

Disclaimer: Always follow safety guidelines and manufacturer recommendations when using rechargeable lithium batteries. Improper usage may result in damage to property or personal injury.

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