At what voltage level will a car battery fail to start the engine?

1 Answers
LeAdrian
07/30/25 6:37am
When a car battery's open-circuit voltage drops below 12.2V or its load voltage falls under 9.5V, the vehicle will experience significant difficulty starting. Car owners should regularly inspect their vehicle's battery through the observation window on the battery. If the window displays black, it indicates the need for charging; green signifies good condition, while white suggests insufficient electrolyte levels. Also known as an accumulator, a car battery operates by converting chemical energy into electrical energy. The commonly referred-to car battery is a lead-acid battery, primarily composed of lead and its oxides, with sulfuric acid solution serving as the electrolyte.
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