It is often very nifty to be able to see what battery charge is left on a smartphone. By default, BlackBerry 10 does not display a percentage indicator on the battery icon, though the option to view it is there. What to do:
Swipe up from the bottom of the display (like in the demo image above) and the battery icon will switch temporarily to a percentage figure. You can do the swipe action from any menu you are in to view this.
BlackBerry 10 veterans will already know this, but there are always new users looking for information like this. Cheers.