KOTETU Battery Monitor changes the default indicator to show remaining power in percents, colours indicator green when fully charged, red - while charging. Has some other options but they are in Japanese.
KOTETU Battery Monitor is, however, far from being precise. The values it shows inside the battery indicator are limited to 100 (green), 100 (red), 75, 45, 19 (red), 9 (red).
and others, just search Google for KOTETU Battery Monitor.
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