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No idea if this is in the Barnes and Noble app store, but I use Gsam Battery Monitor with the Gsam Battery Monitor Icon Pack. You have to install both for it to work. The battery monitoring program passes how many percent is left to the icon pack and overlays the default battery icon. It even shows on the lock screen on some devices. Like I said, I'm not sure if it's available for the nook, but its probably the best thing for what you want.
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