2C is twice the battery capacity, such as the NCR18650PF cell, the rated capacity is 2750mAh, then if the current reaches 2750mA when charging or discharging, then it is 1C charge and discharge, if the charge and discharge current is 275mA, then it is 0.1C.
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The battery cell is generally divided into energy type and power type, and the charging and discharging current of the energy type battery is relatively small, such as charging 0.3C and discharging 3C;
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The charging and discharging current of the power cell is relatively high, such as charging 1C and discharging 10C.
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A 1C charge is roughly equivalent to a full charge in an hour, which is already a very fast charging speed. In the past, most batteries can not withstand such a fast charging speed, and the battery will heat seriously.
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With the progress of the battery process, many of the batteries now can support 1C fast charging, such as the battery used by mobile phones.
Discharge current 2C indicates that the battery discharge rate is 2. The battery discharge C rate is charge\/discharge rate = charge\/discharge current\/rated capacity. C rate of battery discharge,1C, 2C, 0.2C is the battery discharge rate, indicating a measure of discharge speed