21700 BATTERY

The 21700 Cylindrical Lithium-Ion Bare Cell Collection brings together world-class, high-drain, and ultra-high-capacity power cells for advanced custom battery pack fabrication, electric mobility (e-bikes, e-scooters), robotics, and high-performance cordless equipment. Featuring authentic Grade-A cells from industry leaders—including the ultra-high discharge EVE INR21700-50PL (5000mAh), maximum-endurance Samsung INR21700-58E (5500mAh), heavy-duty Sony/Murata US21700VTC6A (4000mAh, 30A), Samsung INR21700-40T / 45T (35A high-drain), Samsung INR21700-50S (5000mAh, 25A), and EVE INR21700-40P (40A)—these flat-top 21700 cells provide greater volumetric energy density, flatter discharge voltage profiles, and reduced thermal rise compared to traditional 18650 formats.

Watch DXF Batteries in Action

Key Features

• Authentic Grade-A industrial cells: Sourced directly from tier-1 manufacturers including Samsung SDI, EVE, and Sony/Murata
• High-drain current delivery: Extreme discharge capabilities up to 35A–45A ratings for heavy brushless motor loads and demanding power equipment
• Superior 21700 energy density: Delivers up to 50% more energy per single cell than standard 18650 formats, reducing total cell count in custom battery packs
• Standard 21700 dimensions: Precision cylindrical form factor (approx. 21.3 mm diameter × 70.5 mm length) matching standard modular spacers and nickel strip matrices
• Flat top terminal construction: Clean unraised terminal faces engineered for rapid spot-welding with pure nickel strips
• Outstanding thermal management: Larger cell diameter and optimized electrode materials facilitate rapid heat dissipation during heavy discharge cycles
• Stable platform voltage: 3.6V–3.7V nominal voltage with 4.2V peak charge ensures consistent power delivery throughout the discharge curve

Specifications & Featured Model Lineup

• Cell Format: Industry-Standard 21700 Cylindrical Bare Cell
• Chemistry: Lithium-ion (INR / NMC)
• Dimensions: Approximately 21.3 mm (Diameter) × 70.5 mm (Length)
• Weight: Approximately 68g – 72g 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 per cell
• Popular 21700 Models in Collection:
  • EVE INR21700-50PL: 5000mAh, extreme high-drain performance (Teal wrap)
  • Samsung INR21700-58E: 5500mAh, ultra-high capacity for maximum runtime
  • Sony / Murata US21700VTC6A: 4000mAh, 30A high-power rating (Green wrap)
  • Samsung INR21700-45T: 4500mAh, 35A high-drain rating (Gray wrap)
  • Samsung INR21700-40T: 4000mAh, 35A high-drain rating (Light purple-blue wrap)
  • Samsung INR21700-50S: 5000mAh, 25A high-power rating (Blue wrap)
  • Samsung INR21700-50GB: 5000mAh, 15A rating
  • EVE INR21700-40P: 4000mAh, 40A high-power rating
  • EVE INR21700-50E: 5000mAh, 15A endurance rating

Package Options

• Available in standardized builder quantity tiers: 1 PCS, 10 PCS, 20 PCS, 50 PCS, and 100 PCS options
• Volume bundle tiers ensure uniform batch matching for internal resistance and resting cell voltages across complex multi-cell series/parallel builds

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 motorcycles, high-speed scooters, cordless power tools, robotics, lawn equipment, custom RC ground power stations, and off-grid solar energy storage systems.

Power your custom battery builds with authentic 21700 cell technology. Watch setups and performance tests on the DXF YouTube channel.