I know that there is a known bug which prevents the battery status from being displayed.
There is a quick workaround for this which will get you the battery status in your status bar.
Open Preferences – > Startup Applications
Select “Add” button, and enter the following details,
Name: For getting battery state
Command: cat /proc/acpi/battery/BAT1/state
Comment: Update the battery Level
Now just hit save and then close.
Now you are all set. Just restart your jolicloud and have fun with the new battery status indicator.