The type of battery chemistry is not mentioned. I once did a state-of-charge model for flooded lead-acid chemistry and you can look at the details here: http://1474orchard.ca/projects/?x=entry:entry120622-013912The curve mrjonny2 posted does not look like lead-acid to me, but you could use the same method to bodge up a calculation.From the voltage range on the chart it appears to be a Li-po cell, to me anyway.I did mine more for interest than anything. I don't think state-of-charge modelling is particularly accurate.
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