I don't know much about batteries but have read up about them online from Battery University and such. With that being said, I could be misunderstanding this but I'll try to summarize what I think is happening.
Originally Posted by kevindd992002
It is my understanding that almost all lead-acid batteries are lead plates bathed in an acid. While the lead resists the corrosive action of the acid bath, it doesn't last forever. Little bits fall off the lead plates and collect at the bottom of a cell until there is enough to make contact with the lead plate. This is called precipitation. Once this occurs, the cell is considered dead. This is where temperature comes into play - warmer temperatures mean softer lead (I think.) A typical 12 volt battery can be charged in this state, but in a dead-cell condition the other cells will be overcharged and will themselves soon fail. In the overall life of the battery, once one cell is damaged the other cells will soon follow suit.
There are construction methods for lead-acid batteries that are intended to mitigate this action, such as circular wound cells. Deep cycle batteries are another design intended to fight this. But in the end, the acid bath will win and the battery will need replacement.
I hope this helps.
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