The Samsung 40T 21700 3.6V 4000mAh lithium-ion battery cell is a high-performance cell designed for demanding applications requiring both excellent power output and strong capacity. With a 4000mAh capacity and a continuous discharge rating of up to 35A, the Samsung 40T is a popular choice for custom battery packs, power tools, mobility applications, energy storage systems, and high-performance electrical equipment.

Manufactured by Samsung SDI, the 40T offers an excellent balance between capacity and power delivery, providing reliable performance, low internal resistance, and long cycle life. It has become one of the most widely used 21700 cells for applications where both runtime and discharge capability are important.

Compared to ultra-high-capacity cells, the Samsung 40T is designed to deliver stronger power output while maintaining excellent runtime, making it a versatile choice for a wide range of battery pack applications.

Battery cells should only be used and assembled by individuals experienced in handling lithium-ion batteries and suitable battery management systems.