Technical battery Voltage

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Technical battery Voltage

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I charged my battery up last night and the green light was on so i thought i take it off.. the ready was somethign like 14.1v but i heard a fizzing sound.. is that ok?
Does that mean i over charged it?

This morning i took a reading and its saying 12.89v is this normal for the batter to lose voltage over night like that? theres nothing plugged into it just sat on my floor
 
Fizzing noise is probably due to the chemical reaction inside the battery, not sure on the voltage dropping that much, did you check it with the battery charger still connected and turned off? Naturally the voltage will decrease slightly over time but I have no idea what is normal over any period of time.
 
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