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

1 Answers
LillianaRose
07/29/25 12:52am
When charging a dead car battery to start the engine, taking a 12V60Ah battery as an example, the charging method adopts constant voltage current-limiting mode. Charge at 14.8V constant voltage and 15A current limit for 16 hours, then charge at 3A constant current for 4 hours, totaling 20 hours. The required charging time is relatively long. A car battery, also called an accumulator, is a type of battery that works by converting chemical energy into electrical energy. The battery refers to a lead-acid battery, which is mainly made of lead and its oxides, with sulfuric acid solution as the electrolyte. The normal service life of a battery ranges from 1 to 8 years, largely depending on the vehicle's condition. With normal alternator recharging and no electrical leakage or grounding issues, the battery can last over 3 years.
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