Here are the current files for the batt-stat and wlan-stat applets. The batt-stat applet needs the battery-status package. The wlan-stat applet needs the python-conic package. They will work in any system tray that is at least 40 pixels high. You need to click on the icons and choose the "Quit" button before returning to Maemo or messing around with your theme in Mer, otherwise weird things happen. They are meant to be run in Maemo, to display in the chroot desktop.