Kobo EREADER User Manual page 6

As it charges, your eReader will display the battery's charge in the top left- hand corner.
Battery icon...
To find out how much power your eReader has left, click the Home button and return to
your Home screen. You'll find the battery icon at the top left-hand corner with the
battery's current capacity.
Going to sleep and waking up
You can turn your eReader off or put it to sleep when you're not reading. Both help your
battery last longer. The main difference is that when you put your eReader to sleep and
then wake it up, you go directly back to the last screen you saw. This could be a page in
the book, the Kobo Store, or an area in your library. If you turn your eReader off you'll
go back to your Home page when you turn it on again.
Note that putting your eReader to sleep can interrupt things like library syncing and
wireless connections.
To put your eReader to sleep: Slide the Power button to the right and release quickly.
To wake up your eReader: slide the power button to right and release.
To turn your eReader off: slide the button to the right and hold until the Off screen
appears.
To turn on your eReader: slide the power button to the right and hold until the device
turns on.
Using the touch screen
Meaning...
Your eReader is out of power.
Your eReader is charging.
Your eReader has partial charge.
Your eReader is fully charged.