🔋 18650 Li-ion Rechargeable Battery (3.7V Lithium-Ion Cell)

📦 Product Overview

The 18650 Li-ion Rechargeable Battery is a high-capacity cylindrical lithium-ion cell widely used in portable electronics, DIY projects, power banks, flashlights, laptops, and battery packs. It provides a nominal voltage of 3.7V and is designed for reliable, long-lasting performance.

The name “18650” refers to its size:

• 18mm diameter

• 65mm length

• 0 = cylindrical shape

⚡ Technical Specifications

🔋 Key Features

✔ High energy density
✔ Rechargeable and reusable
✔ Lightweight and compact
✔ Long cycle life
✔ Low self-discharge rate
✔ Stable voltage output

🛠 Applications

This 18650 battery is widely used in:

• Power banks

• Flashlights & torches

• Laptop battery packs

• Solar energy storage systems

• DIY battery packs

• Electric scooters & bikes

• CCTV backup systems

• Arduino & robotics projects

🔄 Charging Information

• Recommended charging voltage: 4.2V

• Use proper Li-ion battery charger

• Do not overcharge or over-discharge

• Use protection circuit (BMS) for safety

🔒 Protection Types

🔸 Protected 18650

• Built-in PCB protection

• Overcharge protection

• Over-discharge protection

• Short circuit protection

🔸 Unprotected 18650

• No internal protection

• Must use external BMS board

🏗 Physical Dimensions

⚠ Safety Guidelines

• Do not short circuit terminals

• Do not puncture or crush

• Use proper Li-ion charger only

• Avoid exposure to high temperature

• Store in cool, dry place

• Do not mix old and new cells

🏆 Advantages

✔ High capacity in compact size
✔ Cost-effective rechargeable solution
✔ Ideal for portable devices
✔ Long lifespan
✔ High discharge capability

🔌 Common Voltage Configuration

• 1 Cell → 3.7V

• 2 Cells (Series) → 7.4V

• 3 Cells (Series) → 11.1V

• 4 Cells (Series) → 14.8V