Samsung 18650

The Samsung 18650 Series Cylindrical Lithium-Ion Bare Cell Lineup delivers industry-standard reliability, high energy density, and high-drain discharge capabilities for professional battery pack builders, e-mobility integrators, and electronics developers. Featuring genuine Samsung SDI cylindrical cells across popular models—including the high-current INR18650-30Q (3000mAh, 15A), high-drain INR18650-25R (2500mAh, 20A), endurance-focused INR18650-35E (3500mAh, 8A), INR18650-20R (2000mAh, 20A), and ICR18650-26J (2600mAh, 5.2A)—these flat-top bare cells provide stable voltage platforms (3.6V–3.7V nominal, 4.2V max charge) and low internal resistance for balanced multi-cell series/parallel pack assembly.

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Key Features

• Authentic Grade-A Samsung SDI cells: Factory-fresh cylindrical cells manufactured to the highest Japanese and Korean industrial quality standards
• High-drain discharge performance: Available with discharge ratings up to 20A–30A for demanding high-draw brushless and motor drives
• Versatile capacity spectrum: Choose from 2000mAh high-power cells up to 3500mAh maximum-runtime cells to match your build criteria
• Standard 18650 cylindrical form factor: Precision dimensions (approx. 18.3 mm diameter × 65.0 mm length) compatible with standard cell holders and spot-welding nickel matrices
• Flat top terminal design: Clean, unraised flat-top positive terminals optimized for automated or manual resistance spot-welding
• Superior thermal stability: High-grade electrode chemistry ensures efficient heat dissipation and robust cycle longevity under intense duty cycles
• High energy density: Maximizes watt-hours per unit volume in tight battery compartments and lightweight builds

Specifications & Model Lineup

• Brand: Samsung SDI
• Cell Format: Industry-Standard 18650 Cylindrical Bare Cell
• Dimensions: Approximately 18.3 mm (Diameter) × 65.0 mm (Length)
• Weight: Approximately 45g – 48g per cell
• Positive Terminal: Flat Top (Unprotected bare cell)
• Nominal Voltage: 3.6V – 3.7V per cell
• Maximum Charge Voltage: 4.2V ± 0.05V per cell
• Discharge Cut-off Voltage: 2.5V – 2.75V per cell
• Popular Models in Collection:
  • INR18650-30Q: 3000mAh nominal capacity, 15A discharge rating (Pink shrink wrap)
  • INR18650-25R: 2500mAh nominal capacity, 20A discharge rating (Green shrink wrap)
  • INR18650-35E: 3500mAh nominal capacity, 8A discharge rating (Pink shrink wrap)
  • INR18650-20R: 2000mAh nominal capacity, 20A discharge rating (Cyan/blue shrink wrap)
  • ICR18650-26J: 2600mAh nominal capacity, 5.2A discharge rating (Pink shrink wrap)
  • ICR18650-30B: 3000mAh nominal capacity, 6A discharge rating (Cyan shrink wrap)

Package Options

• Available in standardized multi-cell volume tiers: 1 PCS, 10 PCS, 20 PCS, 50 PCS, and 100 PCS options
• Larger pack quantities provide consistent production batches with closely matched internal resistance and cell voltages for custom pack building

Safety & Usage Restrictions (Important Notice)

• Unprotected bare cell warning: These are bare industrial lithium-ion cells without built-in protection circuit boards (no PCM/PCB).
• Professional assembly only: Intended exclusively for qualified technicians building multi-cell battery packs equipped with an appropriate Battery Management System (BMS) with overcharge, over-discharge, over-current, and temperature protection.
• Never carry loose cells: Do not transport loose cells in pockets, bags, or toolboxes where contact with keys, coins, or metal objects can cause short circuits, fire, or severe injury. Always store in non-conductive plastic battery cases.
• Prohibited consumer use: Not suitable for direct, loose consumer replacement use in flashlights, toys, or consumer vaping hardware lacking proper cell enclosures and protection.
• Charging precautions: Charge only on a dedicated lithium-ion CC/CV smart charger at recommended rates (0.5C–1C). Never leave charging cells unattended.
• Physical inspection: Inspect cell outer wraps and terminal insulator rings before every use. Never charge or weld dented, punctured, swelling, or leaking cells.

Why Choose DXF?

• Direct sourcing and rigorous incoming cell voltage and internal resistance sorting
• Extensive model availability across high-capacity and high-drain specifications
• Secure industrial packaging ensuring cell integrity during international transport
• Professional customer service and global warehouse logistics

Recommended Applications

Engineered for custom multi-cell battery pack construction in electric bicycles (e-bikes), electric scooters, cordless power tools, robotics, lawn equipment, custom RC ground power stations, portable electronics, and off-grid solar energy storage systems.

Power your custom battery builds with authentic Samsung cell technology. Watch setups and performance tests on the DXF YouTube channel.