In Fedora 16, starting with changes in 3.3.0 that cause a battery icon to now show up for my bluetooth mouse, the wrong icon appears if the mouse goes to sleep. Instead of getting one icon for the laptop battery and one for the mouse, as when xfce4-power-manager starts, I get two icons for the laptop battery when the mouse goes to sleep from inactivity instead of disappearing. When I start using the mouse the icon does not change back, but instead remains a duplicate of the laptop battery icon.
As we don't use trayicons for this anymore in git master, but a panel-plugin, this bug should be fixed now.