Google Android 3.0 User Manual page 36

Home and Android basics
AUG-3.0-100
Open the Settings app and touch Applications > Battery use.
S
The Battery Use screen lists the apps that have been using the battery, from
greatest to least battery use.
The discharge graph at the top of the screen shows battery level over time,
since you last charged the tablet, and how long you've been running on battery
power. Thin green lines below the chart indicate short periods of time when you
were connected to a charger. The thin blue line shows when the tablet was
active.
S Touch an app in the Battery Use screen to learn details about its power
consumption.
Different apps offer different kinds of information. Some apps include buttons
that open screens with settings to adjust power use.
S Touch the discharge graph to open a screen with details about when the tablet's
radios, screen, and other features were using the battery.
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Android User's Guide