18500 Batteries | Reliable Rechargeable Lithium-Ion Cells

A 18500 battery is a rechargeable lithium-ion cell with a compact yet powerful design, featuring standard dimensions of 18mm in diameter and 50mm in length. It serves as an ideal midpoint between 18350 and 18650 cells, offering a balance of portability and energy capacity. These cells are widely used in tactical flashlights, medical instruments, industrial devices, and power tools that require a high-drain yet compact power source.

Technical Specifications

• Voltage: 3.6V – 3.7V nominal, full charge at 4.2V, and discharge cutoff at 2.5V – 3.0V.

• Capacity Range: Typically between 1000mAh and 2000mAh, depending on the battery chemistry and intended application.

• Battery Chemistry Types:

  • Lithium Cobalt Oxide (LiCoO₂ - LCO): High energy density with moderate discharge capability.
  • Lithium Manganese Oxide (LiMn₂O₄ - LMO): Enhanced safety and heat resistance.
  • Lithium Iron Phosphate (LiFePO₄ - LFP): Exceptional cycle life and ultra-safe operation, but nominal voltage is 3.2V instead of 3.7V.

• Discharge Rate (CDR): Certain high-drain 18500 cells offer continuous discharge rates of 10A – 20A, making them suitable for power-intensive applications.

• Cycle Life: Can exceed 500 to 1000+ charge cycles, depending on usage and chemistry.

Protected vs. Unprotected 18500 Cells

• Protected 18500 Batteries: Feature a built-in protection circuit to prevent overvoltage, short circuits, and deep discharge, making them safer for standalone use.
• Unprotected 18500 Batteries: Preferred for battery packs, high-performance applications, and devices with external Battery Management Systems (BMS).

Industry Applications for 18500 Batteries

✔ High-Performance LED Flashlights: Used in compact, high-lumen tactical flashlights.
✔ Medical & Industrial Equipment: Found in portable monitoring devices, sensors, and laboratory instruments.
✔ Vaping & Compact Power Modules: Integrated into high-powered vape mods and custom energy storage units.
✔ Specialized Battery Packs & Robotics: Commonly used in custom-built battery packs for automation and industrial applications.

Choosing the Right 18500 Battery

🔹 Voltage Compatibility: Verify that your device supports 3.6V or 3.7V, as some may require lower-voltage LiFePO₄ (3.2V) cells.
🔹 High-Drain vs. Standard Cells: Devices requiring rapid power output should use high-CDR 18500 cells.
🔹 Button Top vs. Flat Top: Check your device’s battery compartment for proper fitment.

At IMR Batteries, we specialize in high-performance lithium-ion cells, ensuring optimal safety, reliability, and efficiency. Browse our extensive inventory of premium 18500 batteries designed for demanding applications.