[covard]

I also have Mobile Shell 3.5.2, and I am not having any problems with the battery icon in the "task bar".

However, I did notice that when I turned on the clock to show on all programs. then it did not show up in the taskbar, nor did it show up when you "clicked" on the taskbar to bring up all the large icons.

Go to the Launcher, Settings, Clock & Alarms, and the MORE tab, and uncheck "Display the clock on the title bar in all programs."

I guess you can have either/or, but not both.
Hope that helps.

Edit: I you really want the clock on the taskbar, were you aware that MobileShell has a battery icon (widget) that you can put on one of your panels? Then you just tap that icon.