Battery icon has different shape in 32px and 22px size

You can see the 32px icon is much thinner than the 22px icon, if they are scaled to the same size. In HiDPI screen (150% scale), 32px is rendered in the same physical size as 22px in a low DPI screen. Users expect to see similar visual result. The bar should be thicker and the green plug should be bigger, too.

If you agree that this is an improvement, I can make a pull request.