18650 Batteries | High-Performance Rechargeable Lithium-Ion Cells

An 18650 battery is a high-performance, rechargeable lithium-ion (Li-ion) cell known for its compact size, high energy density, and long lifespan. With standard dimensions of 18mm in diameter and 65mm in length, it is one of the most widely used battery types in high-drain devices, including flashlights, laptops, power tools, and electric vehicles (EVs).

Technical Specifications

• Battery Chemistry Options:

  • Lithium Cobalt Oxide (LCO - LiCoO₂): High energy density, ideal for long-lasting performance.
  • Lithium Manganese Oxide (LMO - LiMn₂O₄): Safer with better thermal stability.
  • Lithium Nickel Manganese Cobalt Oxide (NMC - LiNiMnCoO₂): A balance of energy, power output, and safety.
  • Lithium Iron Phosphate (LFP - LiFePO₄): Superior safety and longevity but lower energy density.

• Voltage: 3.6V or 3.7V nominal, full charge at 4.2V, with a discharge cutoff around 2.5V – 3.0V.

• Capacity: Typically ranges from 1200mAh to 3500mAh, depending on chemistry and manufacturer.

• Discharge Rate (CDR): High-drain versions support up to 30A or more for demanding applications.

• Cycle Life: Designed to last between 300 to 1000+ charge cycles with proper usage.

Protected vs. Unprotected 18650 Batteries

• Protected 18650 Batteries: Include an internal protection circuit to safeguard against overcharging, over-discharging, and short circuits. These are slightly longer (~70mm) due to added circuitry.
• Unprotected 18650 Batteries: Lacks built-in safety mechanisms and are commonly used in battery packs with external Battery Management Systems (BMS).

Common Applications for 18650 Batteries

18650 batteries are widely used in:
✅ Consumer Electronics: Laptops, power banks, and high-performance flashlights.
✅ Electric Vehicles & E-Bikes: Popular in battery packs for Tesla, electric scooters, and mobility devices.
✅ Power Tools: Cordless drills, saws, and industrial-grade equipment.
✅ Energy Storage Systems: Solar power storage, backup UPS systems, and off-grid battery banks.

Choosing the Right 18650 Battery

Before purchasing an 18650 battery, check for:
📌 Flat Top vs. Button Top: Flat tops fit certain battery holders, while button tops extend slightly.
📌 Protected vs. Unprotected: Protected cells are better for standalone applications, while unprotected cells are best for controlled battery packs.
📌 High-Drain vs. Standard Cells: Devices requiring high power output (flashlights, tools) need high-discharge cells.

At 18650Battery.com, we offer a wide selection of authentic, high-performance 18650 batteries from leading manufacturers. Browse our inventory to find the right power source for your needs!