The battery is considered fully charged when the difference between battery voltage and charging voltage is within 100mV and charging current is less than C/10. The condition may change according to different battery characteristics
Until the voltage reaches the cutoff charging voltage Ucha, the charging process switches to the second phase when it is charged with the constant voltage (CV) mode. In the CV phase, the charging current gradually decreases until the current reaches the predefined end-of-charge current Ie.
When a battery is connected to a circuit, the electrons from the anode travel through the circuit toward the cathode in a direct circuit. The voltage of a battery is synonymous with its electromotive force, or emf. This force is responsible for the flow of charge through the circuit, known as the electric current.
So as charging continues at a constant voltage, the charging current decreases due to the decreasing potential difference between the charger-output voltage and the battery terminal voltage as the battery charges. Expressed differently, the charging current is highest at the beginning of the charge cycle and lowest at the end of the charge cycle.
The voltage of a battery is synonymous with its electromotive force, or emf. This force is responsible for the flow of charge through the circuit, known as the electric current. battery: A device that produces electricity by a chemical reaction between two substances. current: The time rate of flow of electric charge.
Basically, A battery voltage is maintained at 4.2V, the charging current gradually decreases, and the charging speed becomes slower. This stage is mainly to ensure that the battery is fully charged.The battery is fully charged when the charging current is lower than 0.1C or 0.05C.
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