How long does it take to charge a dead car battery to start the engine?

1 Answers
McBrielle
07/29/25 3:44pm
Charging time for a dead car battery: Taking a 12V60Ah battery as an example, the charging method adopts constant voltage with current limiting. Charge at 14.8V constant voltage and 15A current limiting for 16 hours, then switch to 3A constant current charging for 4 hours, totaling 20 hours. A fully charged battery can be identified by the following phenomena, or by observing the charge indicator turning green. Below are the indicators of a fully charged battery: 1. A large number of bubbles are generated inside the battery, showing a "boiling" phenomenon. 2. The terminal voltage rises to the maximum value and does not increase further within two hours. 3. The electrolyte level rises to the highest position and does not increase further within two hours.
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