At what voltage is a 12V battery considered bad?

1 Answers
NathanLee
07/30/25 4:57am
A good 12V battery will recover to 11.5V after being completely discharged, so a battery with a virtual voltage below 11.5V is generally considered damaged. Types of automotive batteries: Automotive batteries typically come in two types: 12V and 24V. For a 12V battery, 10.5V is its minimum discharge voltage. The voltage level of the battery directly affects the car's startup. If the car is difficult or unable to start, it is likely due to low voltage. If the battery is damaged, it could be due to excessively high voltage. Therefore, if the car fails to start, it is highly likely that the voltage has dropped below 10.5V, in which case the battery needs to be charged with a charger. Note that if the battery frequently runs out of power, it is recommended to replace it. Reasons for automotive battery discharge: The common reasons for a car battery running out of power are forgetting to turn off car appliances after exiting the vehicle or faults in the generator or the battery itself. Proper usage is essential to extend the battery's lifespan.
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