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I think if you turn off the PW by pressing the power button for 7 sec could save some batterie instead of just sending it to the screensaver, cause WLAN/3G is turned off even if not in airplane mode before.
At least my WLAN Scanner can not find my PW on the local networked when switched off by pressing the power button by 7 sec and i think emailed books don't arrive before you turn it on again.
But it's correct that the state of the screen doesn't influence battery life cause thats the advantage of eink.
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