title_body: What settings are the most energy efficient on a Nook Color? I have seen some touch screen readers that have a gray on black background scheme that helps to reduce the power consumption and increase battery life. But those settings do not really exist on the Nook Color that I can find.  What setting is more efficient, and does it save any significant amount of battery life? Is there any way to do a custom color set?
upvoted_answer: Generally, the best way to save battery on a NOOK Color (or any device) is to:
  
  
  Lower the brightness
  Turn off Wifi and Bluetooth unless necessary
  
  
  These two steps can more than double your battery life on some devices.