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INR21700-40T is a high-drain lithium-ion cell in the 21700 form factor from Samsung SDI. It is one of the most popular batteries in its class thanks to its strong combination of high capacity and high discharge capability.
It offers a capacity of 4000 mAh and supports a discharge current of up to 35 A, making it an excellent choice for power tools, battery packs, electric mobility, and other high-power devices.
Interesting fact: the INR21700-40T was one of the first 21700 cells to be widely adopted by professional power tool manufacturers as a replacement for 18650 cells. This shift allowed tools to gain more power and longer runtime without increasing battery pack size, and helped the 21700 format quickly become an industry standard for high-power applications.
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