How long does it generally take to charge a dead battery?

1 Answers
NatalieRose
07/29/25 1:00pm
Taking a 12V60Ah battery as an example, the charging method is as follows: use constant voltage and current limiting for charging. Charge at 14.8V constant voltage and 15A current limiting for 16 hours, then charge at 3A constant current for 4 hours, totaling 20 hours. You can determine if the battery is fully charged based on the following phenomena, or observe the charge indicator turning green to indicate full charge: 1. Bubbles: A large number of bubbles are generated inside the battery, showing a "boiling" phenomenon; 2. Voltage stops rising: The voltage rises to the maximum value and does not increase further within two hours; 3. Electrolyte: The electrolyte rises to the highest level and does not increase further within two hours.
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