The behavior of your battery meter sounds just like mine on the Touch and the Glo. Slow to start showing drain at the top end and much faster the last 25⅝ shown. Probably because they never calibrated a curve to allow for the voltage dropping off much more quickly vs. remaining current on the low end of the curve. It's enough of a change that a table of values might have been better than trying to fit a curve, though I do wonder that the curve may move around a bit as the battery ages.
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