Here is where most people stop reading and get into trouble.
A key nuance in the datasheet is the distinction between continuous and pulsed discharge. The NCR21700T can deliver (5 seconds on, 55 seconds off) with a temperature rise of only 15°C above ambient. This makes the cell "hot" in performance yet thermally manageable for applications like power tools or e-bike acceleration. However, the datasheet highlights that pulsed operation at 35A induces localized heating at the current collector tabs, which can degrade the separator if pulses exceed 10 seconds. Therefore, "hot" use requires strict duty-cycle adherence. panasonic ncr21700t datasheet hot
The Panasonic NCR21700T is a Formula 1 engine in a world of commuter sedans. The datasheet proves it is capable of astonishing 35A discharge with minimal voltage sag (thanks to that low internal resistance). Here is where most people stop reading and get into trouble