How Long Does It Take to Charge a Dead Car Battery with the Engine?
1 Answers
Relying on the car's own alternator to charge, it takes at least 10 hours to fully charge the battery. Methods for quick charging a car battery: 1. Constant Voltage Charging Method: Also known as the floating charge method, this involves adjusting the charging voltage to a value higher than the battery's full voltage for charging. The charging current gradually decreases over time (as the battery voltage gradually increases and the voltage difference decreases). As long as the charger's charging voltage is kept constant, the operation is extremely easy. 2. Constant Current Charging Method: This method controls the charging current to remain constant during charging. As the battery gradually becomes fully charged, the voltage at both terminals increases, and if the voltage remains unchanged, the current will gradually decrease. To keep the current constant, the charging voltage needs to be continuously increased, making the operation quite complex. 3. Trickle Charging Method: This involves charging a battery that is almost fully charged (90% or 95%) with a very small current for an extended period. Some say the smaller the current and the longer the time, the better the effect, but in practical use, one must compromise based on their available time.
