Not sure, but :
What happens when you resize to small now ?
Do you get the white square again, or does it resize the icon ?
About the battery : you could use the xfce-battery-plugin (works great).
As I understood a few months ago, once the icons are there, they stay. I haven't tried it though.
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OK, I'll try making the icon smaller.
Now, when you resize to small, all the elements in the taskbar get smaller, however the big icon stays big, so the taskbar itself stays big, looks strange.
Actually I am using the xfce-battery-plugin, but the icon is too big. When you resize the taskbar to small it does the same thing, i.e. everything gets smaller, but the taskbar stays big because the icon is big.