4000mAh 21700-40Y ultra-high-rate power lithium battery

The 21700‑40Y is a top‑tier, ultra‑high‑rate cell based on an NCM/NCA ternary chemistry. Its key selling points are an exceptionally low internal resistance of 3.5 mΩ and an ultra‑high discharge rate of 70 A, coupled with a 4,000 mAh capacity, a stable 3.6 V nominal voltage, and 12 A fast charging. It is ideally suited for extreme‑power applications such as high‑performance power tools and racing‑grade equipment. The cell employs premium high‑nickel NCM cathode material and a high‑conductivity electrolyte, paired with high‑quality current collectors, to significantly reduce internal resistance and deliver outstanding rate performance. Manufacturing utilizes state‑of‑the‑art precision processes, including laser welding and vacuum filling, to ensure superior sealing. Each unit undergoes 100% full inspection and rigorous testing under extreme operating conditions, guaranteeing safe and stable high‑current discharge. Its core advantages lie in the simultaneous achievement of ultra‑low internal resistance and ultra‑high rate capability: it delivers 70 A instantaneous discharge without voltage sag, maintains over 80% of its initial capacity after 500 cycles, and weighs no more than 69.0 g, making it compatible with 21700‑format devices. Applications span extreme‑power equipment, racing drones, and more, with support for customized solutions to serve high‑end, demanding markets overseas.