| ischmitz |
04-12-2014 09:55 AM |
If you fully charge a lead acid battery and then keep it at the float voltage it will retain a surface charge in addition to the regular charge. To properly determine the charge state from the open-circuit voltage you first need to get rid of that surface charge.
Take a look at any 1/10 or 1/100 discharge curve and you will often see the voltage drops drastically at the beginning (surface charge gets costumed) and then the graph settles into the regular discharge phase (complete electrode participates in electrochemical process)
All references I see define the cell voltage for lead acid at 2.1 Volt for a fully charged 6-cell battery putting out 12.6 Volt. Maybe someone has different data SmileWavy
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