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Is 13.5V Normal for a Car Battery with Engine Off and 13.9V When Running?

KAmilEsp 47849 10
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  • #1 7527474
    KAmilEsp
    Level 11  
    Posts: 22
    Rate: 8
    Hello.
    I bought a battery from a friend. It spins nicely... no problems with it.
    However, when I measured its voltage (with disconnected terminals), it showed 13.4 - 13.5V. Is this normal???
    When the engine is running, the landing speed is 13.8 - 13.9.
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  • #2 7527511
    fuutro
    Level 43  
    Posts: 9921
    Help: 1450
    Rate: 834
    This is normal, nothing to worry about.
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  • #3 7527528
    KAmilEsp
    Level 11  
    Posts: 22
    Rate: 8
    They write everywhere that it should be 12.6... so what is the NORMAL maximum voltage on a disconnected battery?
  • #4 7527549
    fuutro
    Level 43  
    Posts: 9921
    Help: 1450
    Rate: 834
    You can charge up to 15.5V, but around 12-14V is not abnormal, everything is ok.
  • #5 7528032
    KAmilEsp
    Level 11  
    Posts: 22
    Rate: 8
    In the morning I went out to the car... battery voltage was 12.25 V.

    Current consumption at standstill 15-20 mA.
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  • #6 7528042
    waldekg
    Level 28  
    Posts: 1130
    Help: 69
    Rate: 169
    Hello. Reliable measurement results are available when the battery is loaded, e.g. parking lights are on. One decimal place is enough for the voltmeter`s measurement range. Regards.
  • #7 7528196
    viper555
    Level 39  
    Posts: 4322
    Help: 582
    Rate: 2152
    Unfortunately, the suggestions are incorrect, the resting voltage is 12.5-12.7V depending on the temperature. Charging voltage within the range of 14.4-14.6V without load, with full load it cannot go below 13.9V. Any other values will damage the battery.P
  • #8 7528578
    KAmilEsp
    Level 11  
    Posts: 22
    Rate: 8
    There`s something I don`t understand... I know that the battery voltage should be 12.5-12.7... but should there also be such values in the morning (like today) in frost -5%??? after all, the electrolyte thickens... and therefore the voltage MUST drop a little.
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  • #9 7528599
    szakkkalll
    Level 16  
    Posts: 156
    Help: 7
    Rate: 51
    let the battery stand for 5 hours with the terminals disconnected, then it should be within the range of 12.5 - 12.8 if the battery is functional. Your charging is poor.
  • #10 7528611
    KAmilEsp
    Level 11  
    Posts: 22
    Rate: 8
    but should it stand at room temperature or in the cold???
  • #11 7528634
    darek_wp
    Level 28  
    Posts: 913
    Help: 119
    Rate: 193
    All voltage measurements both outside and in the car, referring to the factory recommendations, should be carried out at a temperature of +20C. Corrections should be taken for other ambient temperatures and individual components.
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Topic summary

✨ The discussion centers around the voltage readings of a car battery, specifically a measurement of 13.4-13.5V when the engine is off and 13.8-13.9V when running. Responses indicate that a resting voltage of 12.5-12.7V is typical for a healthy battery, while charging voltages can range from 14.4-14.6V. It is noted that voltage can vary with temperature, and measurements should ideally be taken at 20°C. Concerns about low voltage readings in cold conditions are addressed, emphasizing that electrolyte thickening can affect performance. Recommendations include allowing the battery to rest for accurate voltage readings and considering ambient temperature effects.
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