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I honestly tell you that I still didn’t understand what is this “cut-off current”, especially since in his other videos about various other elements this same parameter is also mentioned. And if you yourself can explain what it is and in as much detail as possible, then this will become very useful for all of us.

As for this, I have long had a different opinion, especially since no one realizes that when it comes to the possibility of loading batteries with currents exceeding 1C, by default the manufacturer means not a stabilized current, but a pulsed one, which can have medium time and even very large gaps (pauses) for resting and cooling the batteries, which dramatically reduces their heating even at high amperage. And with an increase in the discharge current above 1C, the pauses in the PWM-currents should also be increased in time, and the pulse loads, on the contrary, should become shorter. That is, the element should be more able to rest and cool, thus not overloading too much. Look carefully and rely on discharge graphs with the temperatures shown at different loads, because you can not heat Li-Ion more than 45-50 degrees Celsius, especially in tightly sealed batteries, that is, without air, which have very poor cooling inside. And amateurs who imagine themselves to be professionals can load elements at their discretion, because it is their own money, time to replace overheated elements, and also their right to risk their own property and skin.

I have never been opposed to a more complete discharge (Li-Ion up to 2.5 or even sometimes up to 2.2v), but we cannot always adjust this threshold, which the manufacturer sets on any of his products by default. So, for example, the controller of my bike automatically turns off the battery when unloading 3v for each element. And this cannot be reconfigured, because this firmware was made at the factory for the sake of more universal compatibility with Li-Po batteries, which cannot be discharged lower than to the threshold of 3.0-3.3v. And this model of the controller does not have the ability to reflash it in the usual accessible ways, which you can use without risk, so that later you simply do not throw this controller into the bin. Therefore, from the very beginning, I focus on batteries for which the manufacturer himself declares a discharge threshold of 3.0v. And when I first met these QB26800 with such a parameter threshold discharge characteristics, they obviously immediately aroused my interest.