the ones in the tray at the bottom?
Yeah, it's a reg setting
There a a ton of cab files here:
http://forum.xda-developers.com/showthread.php?t=257415
That do the various reg settings for you, but all its doing is
Hide/Show battery indicator in Task bar
If you wish to hide the battery indicator in the task bar on some devices, you can set:
HKLM\Services\Power\ShowIcon = 0 (DWORD decimal)
And to show:
HKLM\Services\Power\ShowIcon = 1 (DWORD decimal)
You may need to soft-reset if just changing the registry doesn't bring it back.