The nominal capacity is the capacity measured from full power to no power (3.3V-3.5V), but there is a condition: the discharge current is determined to be a certain value, such as 1C, or 0.5C, because of the high current discharge measured. The capacity is smaller than the capacity obtained by small current discharge, and the large current is not completely discharged.
There is indeed electricity below 3.5V, but in order to protect the battery, it will not be released. If it is completely released, it will cause problems such as crystal lattice collapse of the pole piece material. This part of the battery has no name.