Quote:
Originally Posted by oncdoc
I pressed the power button once and keylock came on.
is that powered down?
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No, that's the same state (effectively) as when you're reading a book, except that the display is (sort of) blanked, and all buttons are ignored EXCEPT for the on/off button. In other words, it just does what it says: locks the keyboard. But the power consumption is the same as all other times: EXTREMELY low, but not zero.
When you press and HOLD the on/off button for a second or two, then the unit will close your current book and actually "power down", so that the only power lost from the battery is normal "leakage" that any battery suffers. However, the difference in power usage between "keyboard lock" state and "powered down" state is SO little that most folks never "power down" their unit, but just put keyboard lock on when not reading, because sometimes buttons can get accidentally pressed with the cover closed, changing your place in your book.
You have to remember that e-Ink is a radically different display technology from pretty much any other display technology out there. All of the others require the constant expenditure of power to keep the display SHOWING something. e-Ink require power only to CHANGE what's being displayed. Once that's done, you can open the battery door, remove the battery, and whatever was last displayed will remain there until well after you die and turn to dust, or until the display is physically broken, whichever comes first...
That's why, with an e-Ink device, you generally never need to worry about trying to "conserve battery power."