title_body: When should I completely poweroff an eink device rather than putting it in stand-by? Given that the technology of eink screens make it so that even during normal usage the power requirement is kept lower than other kind of displays, when it is advisable to completely shut-down the device instead than putting it in stand-by? I'm asking this for the sake of device (and possibly battery) health and power consumption.
  
  As an example, I usually use stand-by, and this seems the handier solution when I use it multiple times in a day for many consecutive days, but maybe not when, i.e., I don't use it for a week or so. Or in other words, is there a time limit that marks the border between advisable poweroff or standby?
upvoted_answer: The biggest issue is likely to be background network use. For example, Amazon's Kindles will continue to use Whispernet and/or WiFi in the background. Assuming you have turned those features off, you would want to power it off entirely only if:
  
  
  You plan to store it for a long period, on the order of months.
  You plan to open up the physical case for some reason.