Rechargeable battery Samsung 21700 30T 3.6V 3000mAh Li-ion

Samsung 21700 30T is a rechargeable lithium-ion cylindrical cell with a nominal voltage of 3.6 V and a rated capacity of 3000 mAh. Engineered for both high-drain and general-purpose applications, this cell offers consistent discharge characteristics and stable voltage under load. The cell format and chemistry make it suitable for integration into battery packs or use as a single replacement cell in compatible devices that accept 21700 cells.

Advantages

The cell provides a balance of energy density and discharge capability, enabling reliable performance in devices that require sustained current output. Its 21700 format increases usable capacity compared with smaller cylindrical cells while maintaining compatibility with standard 21700 chargers. The Li-ion chemistry allows for multiple charge cycles with predictable capacity retention when charged and stored according to recommended conditions.

Suitable for

• High-drain power tools and cordless equipment
• E-bike and electric scooter battery modules
• High-output flashlights and portable lighting
• Power banks and portable electronics requiring 21700 cells
• Battery pack assembly and DIY energy storage projects

Key specifications

• Cell type: cylindrical Li-ion
• Nominal voltage: 3.6 V
• Nominal capacity: 3000 mAh
• Cell size: 21700 format (diameter ~21 mm, length ~70 mm)
• Designed discharge behavior: suitable for high-drain applications
• Chemistry: lithium-ion

How to use

Use the Samsung 21700 30T in devices and chargers specified for 21700 lithium-ion cells. Insert the cell observing correct polarity and ensure firm electrical contact. Charge only with chargers designed for lithium-ion cells and follow charger instructions for current and voltage limits. Do not mix cells of different capacities, ages or states of charge within a pack without proper battery management and balancing. Replace cells showing signs of damage, swelling, excessive heat, leakage or other abnormal behavior.

Usage recommendations

Store and charge the cells in a cool, dry place away from direct heat sources. Maintain recommended charging current and avoid deep discharges below manufacturer-recommended cutoff voltages. Use appropriate protective circuitry when assembling multi-cell packs and follow local regulations for transport and disposal of lithium-ion batteries.