3.7V 18650 Li-Ion Battery

3.7V 18650 Li-Ion Battery is one of the most dependable, high-capacity rechargeable batteries used in a wide range of electronic devices, DIY projects, and industrial applications. Known for its compact size, long cycle life, and powerful energy output, the 18650 lithium-ion battery has become a standard power source for hobbyists, engineers, and manufacturers looking for efficiency and durability. Whether you are building an IoT device, powering an LED project, upgrading your power bank, or assembling an electric vehicle battery pack, this 3.7V 18650 cell delivers reliable performance and excellent energy density.

Why Choose a 3.7V 18650 Li-Ion Battery?

The 18650 Li-ion battery stands out due to its versatility, stable discharge characteristics, and high mAh ratings, which make it ideal for both high-drain and low-drain applications. Its cylindrical design ensures easy handling and integration into battery holders and custom battery pack configurations. With advanced lithium-ion chemistry, it offers superior rechargeability, reduced self-discharge, and excellent overcharge protection when paired with a suitable BMS (Battery Management System).

Investing in a high-quality 3.7V 18650 battery ensures consistent performance, long operating hours, and better device reliability — perfect for professionals and DIY enthusiasts who need a trusted energy solution.

Key Specifications

• Battery Type: Lithium-Ion (Li-Ion)

• Nominal Voltage: 3.7V

• Capacity Range: 1500mAh to 3500mAh (varies with model)

• Rechargeable: Yes

• Standard Charge Voltage: 4.2V

• Discharge Cut-off Voltage: 2.75V – 3.0V

• Current Rating:

  • Continuous Discharge: 5A–20A (depending on model)

  • Pulse Discharge: Up to 30A

• Dimensions: 18mm (diameter) × 65mm (length)

• Weight: 40g–50g

• Cycle Life: 500–1000 charge cycles

• Operating Temperature:

  • Charge: 0°C to 45°C

  • Discharge: –20°C to 60°C

• Protection: Unprotected / Protected (optional variants)

• Form Factor: Cylindrical 18650 cell

Top Features

1. High Energy Density

The 18650 Li-Ion battery packs a significant amount of power into a compact size, making it one of the most efficient rechargeable batteries available for portable electronics and power applications.

2. Long Cycle Life

Designed for repeated use, this battery can withstand hundreds of charging cycles, offering a reliable long-term power solution for your devices.

3. Stable Voltage Output

It delivers a consistent 3.7V output, ensuring stable performance for sensitive electronic circuits, sensors, and motor-driven systems.

4. Fast Recharge Capability

With advanced lithium-ion chemistry, the battery supports quicker charging times compared to older rechargeable technologies like Ni-Cd and Ni-MH.

5. Lightweight & Compact

Its compact cylindrical design makes it ideal for portable devices and DIY electronics where space and weight optimization are crucial.

6. Low Self-Discharge

The battery retains most of its charge even when stored for long periods, ensuring readiness whenever you need it.

7. Supports High-Drain Applications

Depending on the model, it can handle high discharge currents, making it suitable for power tools, robotics, vaping devices, and flashlights.

Applications

The 3.7V 18650 Li-Ion Battery is widely used across consumer electronics, robotics, renewable energy storage, and industrial applications. Some common uses include:

• Power Banks and Backup Power Systems
  Ideal for custom-built power banks, UPS systems, and emergency backup modules.

• Flashlights and LED Lighting
  Widely used in high-power LED torches and lighting systems due to stable output and long runtime.

• DIY Electronics and IoT Projects
  Perfect for microcontroller-based projects such as Arduino, Raspberry Pi, and ESP32 devices.

• Electric Vehicles and E-Bikes (Battery Packs)
  Multiple 18650 cells are combined to form large battery packs for e-bikes, scooters, and energy storage systems.

• Portable Fans, Speakers, and Gadgets
  Ensures long-lasting performance for personal electronics and small appliances.

• Robotics and Drones
  Delivers high discharge currents needed for motors and controllers.

• Solar Energy Storage Projects
  Compatible with solar charging systems for off-grid applications.