High-capacity 21700 lithium-ion battery with stable 3.6V output and 4000mAh for extended runtime

Premium battery case made of reinforced ABS plastic with precise CNC molding for secure fit and impact resistance

Optimized for high-drain power tools, electric vehicles, and industrial equipment requiring consistent performance

Advanced cell structure ensures low internal resistance and minimal heat generation during heavy use

Compact 21700 size (21mm diameter) with space-saving design for versatile integration into DIY projects

Includes corrosion-resistant nickel-plated contacts for reliable conductivity and reduced voltage drop

Certified safe with built-in overcharge/discharge protection and thermal stability up to 60°C

Ideal for professional cordless drills, LED work lights, and portable medical devices needing durable power solutions