add some more stylish battery icons (by the Oxygen Team http://www.oxygen-icons.org LGPL)

app/src/main/res/drawable-hdpi/battery_0.png

app/src/main/res/drawable-hdpi/battery_100.png

app/src/main/res/drawable-hdpi/battery_25.png

app/src/main/res/drawable-hdpi/battery_50.png

app/src/main/res/drawable-hdpi/battery_75.png

app/src/main/res/drawable-hdpi/battery_unknown.png

app/src/main/res/drawable-mdpi/battery_0.png

app/src/main/res/drawable-mdpi/battery_100.png

app/src/main/res/drawable-mdpi/battery_25.png

app/src/main/res/drawable-mdpi/battery_50.png

app/src/main/res/drawable-mdpi/battery_75.png

app/src/main/res/drawable-mdpi/battery_unknown.png

app/src/main/res/drawable-xhdpi/battery_0.png

app/src/main/res/drawable-xhdpi/battery_100.png

app/src/main/res/drawable-xhdpi/battery_25.png

app/src/main/res/drawable-xhdpi/battery_50.png

app/src/main/res/drawable-xhdpi/battery_75.png

app/src/main/res/drawable-xhdpi/battery_unknown.png

app/src/main/res/drawable/battery_0.png

app/src/main/res/drawable/battery_100.png