Can Driving Charge the Battery?

[LaDominic]

Driving can charge the battery. The engine directly drives the alternator via a belt. Once the engine starts, the alternator begins working. The electricity generated by the alternator undergoes rectification and voltage stabilization. Therefore, as long as the engine is running, even at idle speed, the battery is being charged. When the battery is depleted, it requires charging at a voltage slightly higher than the rated voltage, typically between 12-14V. The voltage produced at idle speed is slightly lower, which is not ideal for fully charging the battery. The battery can be fully charged when the engine speed exceeds 1200 RPM, but this takes a considerable amount of time. Generally, driving in third gear or higher can gradually restore the battery charge, eliminating the need to rev the engine while stationary. A fully charged battery can be identified by the following indicators, or by observing the battery's eye turning green: 1. A large number of bubbles form inside the battery, creating a "boiling" effect; 2. The terminal voltage rises to its maximum level and does not increase further for two hours; 3. The electrolyte level rises to its highest point and does not increase further for two hours.