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The battery should have a nominal voltage of 12V.
This means that it will be about 12.8V fully charged.
Charging voltage is regulated by the alternator and should be around the 13,7 to 14,4V i think.

If you measured your new battery at 14,6V then I would suggest either a faulty meter, a faulty battery or an error of measurement.
 

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Lead acid batteries are damaged when being overcharged as the excess current beyond a full charge breaks down their electrolyte.
You can overcharge a battery and if you're lucky and it doesn't short or explode it could even reach 16v
If you measure a healthy battery directly after charging, you will get a figure in the high 13s or low 14 volts.
However a rested healthy full battery at room temperature shoud read about 12.6-12.8V.
Hence the original arguement about it needing more current to charge than the alternator is producing is not valid in this case.
 
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