And if the battery has open cells, it will read fully charged when left idle. However, the loose piece will touch when the battery cools off, giving an incomplete connection. As a result, the current on the battery will be cut or reduced. When the battery is under such conditions, the weld pieces connecting together the battery cells separate or become loose. This could include the intense heat of the load. Most of the time, you will get wrong readings when the battery is under severe conditions. Why Does A Car Battery Show Wrong Readings? Any voltage more than 12.9 volts is a sign that your battery has excess voltage. If the voltage on your voltmeter is between 12.4 and 12.8, your battery is in good health. Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means it’s about 50% charged.Ī fully charged battery will normally register between 12.6 and 12.8 volts on a voltmeter. Try to recharge the battery and see if it will work. But if it drops below 9.6 volts by the end of the test, the battery may be bad. When you try to start the car with a dead battery, the lights will become extremely dim.Īs long as the battery voltage remains above 9.6 volts, the battery is considered “good”. But the voltage under a load is what matters. So, can a car battery read good but be bad? Yes, without a load, a faulty battery may read 12+volts. If it reads 10.5V or less when under starter load, you need a new battery. If the battery measures 12V with no load, it is bad or badly in need of a charge. If it is bad, it will die or drop significantly when put under load. 5 Conclusion Is It Possible for A Battery to Read 12V and Still Be Bad?Ī battery could show a voltage higher than 12 volts and still be bad.
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