Can the battery be charged when the car is idling after starting?

1 Answers
FelixFitz
07/29/25 7:24pm
Idling the car after starting cannot charge the battery. The standard procedures for charging the battery are as follows: 1. Voltage; The battery already has a certain voltage. When the voltage is below 13.4V, starting the car will be difficult. To charge a battery at this voltage, it generally requires the engine to run at over 1500 RPM, and sometimes even over 1700 RPM. 2. RPM; If the battery does not have enough power to start the engine, maintaining the engine at over 1500 RPM for more than 20 minutes can provide enough charge for one start. Maintaining it at over 1500 RPM for more than 30 minutes can provide enough charge for a start the next day. 3. Time; If you need to charge the battery more fully, based on the second point, it is best to charge at over 1900 RPM, and the time can be adjusted as needed.
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