Comment 9 for bug 513716

I rebooted without the AC plugged in, and now there's the battery level in the "Notifications mini-applications".

I've spotted what may be the cause, there's a preference option in this indicator that is set by default to "show only when charging/discharging" so I *think* the cause may be that when you boot with the AC plug and the battery is at 100% of its charge, this applet it's not displayed because of before mentioned option is active (which is fine, as it's the intended behavior) but when you remove the AC plug, nothing alerts the applet that the battery is now discharging and it must be displayed.

So this bug (at least for me) resume as follows:

"Battery level indicator fails to display on charging/discharging mode when booting with ac plugged in and battery at %100 of its charge"