Nominal Capacity ( Cn ):
The Nominal Capacity (Cn) is the electric charge (in Ah) which a battery can supply with a current of Cn/20 (A) to a final voltage of 10.5 volts.
Nominal Reserve Capacity ( Cr,n ):
The nominal reserve capacity (Cr,n) is the period of time (in minutes) for which a battery can maintain a discharge current of 25A to a cut-off voltage of 10.5 volts.
Cranking Performance ( Is ):
The cranking performance is the disharge current (Is) which a battery can supply at -18EC in case of class A and B for 60s to a minimum voltage of 8.4volts.
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