This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
BatterySet is an internal app that constantly flashes the battery percentage.
This app isn't present on many SwitchBoard builds, however it is known to exist in 5.X and 6.X builds. If it is present, it is usually hidden from SwitchBoard with a key in Info.plist ("ShowInSwitchBoard" is set to false).
The Contents of This App
BatterySet CodeResources Info.plist PkgInfo _CodeSignature _internal_BatterySet.png com.apple.BatterySet.plist