18650 2200mAh 3.7V Rechargeable Li-Ion Battery for DIY & IoT Projects

18650 2200mAh 3.7V Rechargeable Li-Ion Battery

The 18650 Lithium-Ion Battery is the gold standard rechargeable cell for portable electronics, IoT devices, and DIY power systems. With a capacity of 2200mAh and a nominal voltage of 3.7V, it delivers reliable, high-density energy storage in the universally compatible 18650 cylindrical form factor.

Key Specifications

• Chemistry: Lithium-Ion (Li-Ion)
• Capacity: 2200mAh
• Nominal Voltage: 3.7V
• Charge Voltage: 4.2V (max)
• Discharge Cut-off: 2.75V
• Dimensions: 18mm × 65mm (standard 18650)
• Cycle Life: 300–500 charge cycles typical

Compatibility & Use Cases

This cell is compatible with standard 18650 battery holders and charger modules like the TP4056. Widely used in Arduino, ESP32, and Raspberry Pi portable IoT builds. Common applications include:

• Portable IoT sensor nodes and data loggers
• DIY power banks and USB charger packs
• Flashlights, headlamps, and portable lighting
• Robotics and mobile platform power supplies
• Backup power for home automation devices

Always use with a protection circuit or TP4056 charger module to prevent overcharge, over-discharge, and short-circuit damage.

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