Forgot to say I am on latest firmware 4.20.
Quote:
Originally Posted by davidfor
What happens if you close the PDF before the device goes to sleep?
And:
Yet another reason not to read PDF 
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It's much better with epubs. It is not a new device so there is battery wear.
Even with pdf battery does not get empty overnight.
I had to read a pdf book to my kids and was surprised to find a charged reader completely empty after 3 1-hour read/23-hour sleep sessions.