What charges a battery? Is it the voltage or the current? Why?

Answer:

The process of charging a battery involves both voltage and *current. Voltage refers to the *pressure that pushes the electric charge through the battery, while current represents the flow of the electric charge itself ¹⁴.

When a battery is being charged, it requires a specific voltage to overcome the internal resistance and drive the current into the battery. This voltage is typically higher than the battery’s terminal voltage ³.

The charging method often involves switching between a constant current (CC) phase and a constant voltage (CV) phase ³. During the CC phase, the battery is charged with a constant current, while in the CV phase, it is charged at a constant voltage ³.

In summary, both voltage and current play crucial roles in charging a battery.

Voltage provides the driving force for the electric charge, while current represents the actual flow of charge into the battery. The specific charging method depends on factors such as battery type and desired charging speed ²³.