18500 Batteries | Compact Lithium-Ion Power Solutions

An 18500 battery is a rechargeable lithium-ion (Li-ion) cell with a compact cylindrical shape, measuring 18mm in diameter and 50mm in length. It serves as a mid-sized alternative between the smaller 18350 and larger 18650 batteries, offering a balance of power, runtime, and portability. 18500 batteries are commonly used in flashlights, vaporizers, medical devices, and custom battery packs that require a compact yet powerful energy source.

Key Features & Specifications

• Voltage: Typically 3.6V or 3.7V nominal, with a full charge voltage of 4.2V and a discharge cutoff around 2.5V – 3.0V.
• Capacity: Usually ranges from 1000mAh to 2000mAh, depending on chemistry and manufacturer.
• Battery Chemistry Options:
  • Lithium Cobalt Oxide (LiCoO₂ - LCO): High energy density for longer runtimes.
  • Lithium Manganese Oxide (LiMn₂O₄ - LMO): Improved thermal stability and safer performance.
  • Lithium Iron Phosphate (LiFePO₄ - LFP): Extremely safe with an extended cycle life, but nominal voltage is 3.2V instead of 3.7V.

Protected vs. Unprotected 18500 Batteries

• Protected 18500 Batteries: Include a built-in protection circuit to prevent overcharging, over-discharging, and short circuits. These are slightly longer than standard cells.
• Unprotected 18500 Batteries: Best for use in devices with built-in battery protection or custom battery packs with external management systems (BMS).

Common Applications for 18500 Batteries

18500 batteries are widely used in:
✔ LED Flashlights & Everyday Carry (EDC) Lights – Providing a compact power solution for high-lumen flashlights.
✔ Medical & Industrial Equipment – Ideal for wireless medical devices, sensors, and testing equipment.
✔ Custom Battery Packs & DIY Electronics – Found in RC devices, robotics, and other niche applications.

Choosing the Right 18500 Battery

📌 Voltage Compatibility: Ensure your device supports 3.6V or 3.7V, as some devices may require lower-voltage LiFePO₄ (3.2V) cells.
📌 Protected vs. Unprotected: If your device doesn’t have built-in safety measures, choose a protected cell.
📌 Button Top vs. Flat Top: Some devices require button top cells for proper connection, while others use flat top designs.

At 18650Battery.com, we offer high-quality, authentic 18500 batteries from top manufacturers, ensuring reliable power and long-lasting performance. Browse our selection today to find the right battery for your needs!