18650 Rechargeable Li-ion Battery (2 Pieces)

The 18650 Rechargeable Li-ion Battery (2 Pieces) is a high-performance rechargeable lithium-ion battery pack designed to provide reliable and long-lasting power for a wide range of electronic devices and DIY projects. Each battery follows the 18650 standard size, measuring approximately 18mm in diameter and 65mm in length, making it one of the most widely used battery formats in portable electronics, robotics, and energy storage applications. This pack includes 2 rechargeable 18650 lithium-ion cells, suitable for use individually or in battery holders and battery packs.

Lithium-ion batteries are known for their high energy density, lightweight construction, low self-discharge rate, and long cycle life compared to conventional rechargeable batteries. They are capable of delivering stable output voltage and can be recharged hundreds of times using a compatible Li-ion battery charger, making them an economical and environmentally friendly power source.

Specifications

• Battery Type: Lithium-ion (Li-ion)

• Battery Size: 18650

• Dimensions: Approximately 18mm × 65mm

• Nominal Voltage: 3.7V DC per cell

• Fully Charged Voltage: 4.2V DC

• Cut-off Voltage: Approximately 2.5–3.0V (recommended)

• Rechargeable: Yes

• Quantity: 2 Pieces

• Chemistry: Lithium-ion

• Cycle Life: Typically 300–500 charge/discharge cycles (depending on usage and charging conditions)

Working Principle

An 18650 lithium-ion battery stores electrical energy through the movement of lithium ions between the positive and negative electrodes during charging and discharging. During charging, lithium ions move from the positive electrode to the negative electrode, storing energy. When connected to a device, the ions move back to the positive electrode, releasing stored electrical energy to power the circuit. This electrochemical process provides efficient energy storage with a stable voltage output and excellent rechargeability.

Features

• Rechargeable lithium-ion technology

• High energy density

• Lightweight and compact design

• Long service life

• Low self-discharge rate

• Stable output voltage

• Suitable for repeated charging and discharging

• Environmentally friendly compared to disposable batteries

• Compatible with standard 18650 battery holders and chargers

Applications

The 18650 Rechargeable Li-ion Battery is commonly used in:

• Arduino and Raspberry Pi projects

• Robotics and automation systems

• DIY electronics projects

• Rechargeable battery packs

• Portable electronic devices

• LED flashlights and emergency lights

• Solar energy storage systems

• Power banks

• Wireless communication devices

• Medical and testing equipment

• Battery-powered tools (compatible models)

• Embedded system development

• Educational and engineering projects

Advantages

• High energy storage capacity

• Rechargeable hundreds of times

• Lightweight and portable

• Stable power output

• Long operating life

• Cost-effective over repeated use

• Suitable for high-performance electronic applications

• Easy integration into custom battery packs

Safety Precautions

• Use only a compatible lithium-ion battery charger.

• Do not overcharge or over-discharge the battery.

• Avoid short-circuiting the battery terminals.

• Do not expose the battery to excessive heat, fire, or water.

• Store the battery in a cool, dry place when not in use.

• If the battery shows signs of swelling, leakage, or physical damage, discontinue use immediately and dispose of it according to local regulations.

The 18650 Rechargeable Li-ion Battery (2 Pieces) is a dependable and versatile power solution for electronics enthusiasts, engineers, students, and professionals. Its rechargeable design, compact size, high energy density, and long cycle life make it an ideal choice for powering portable devices, robotics, embedded systems, LED lighting, DIY electronics, and numerous battery-operated applications requiring reliable and efficient energy storage.