Battery voltage fluctuating ?s

PhillyFenom

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So I have the honda hack and have it showing the battery voltage...normally the battery voltage reads at 14.4>14.5..but recently it's been fluctuating all over the place as low as 12.3 to 13.8 and back up to 14.3...this is with no ac on no lights on(just drl) I don't lose any power there's no dimming of dash or radio or interior lights...I found when I turn on my headlights the voltage stays at 14.5 again could this be a battery issue or something else? I have to oem battery and bought the car in 2019. I do live in California in the desert so extreme heat but recently its been cool, not cold. Just curious as this just started happening randomly
TIA
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calonzo

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Yes, the charging system doesn't always need to be charging the battery at full bore. As long as it is between about 12.3 to 14.5, it's fine.
 

latole

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bikejog

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It is for old Honda.
Same on new one ?

PhilyFenon,
having too much information (this battery voltage) can be more confusing than useful
Same or similar to the system used in my 2000 Prelude. One thing for sure is the battery voltage will flutuate between around 12.7v to 14v depending on the load and other factors.

I will see if I can dig up anything from the service manual when I get home tonight.
 

bikejog

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I confirmed our Civics have a version of the Multi-Mode Charging system. Nothing to worry about if no charging code is thrown and the BATT light is not on. I think if the voltage never gets near 14V during high load conditions, then you should be worried.

Honda Civic 10th gen Battery voltage fluctuating ?s 1634341451944
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