title_body: What information does my Kindle share with Amazon? One of my Kindles spends most of it's time in the car.  Most books are loaded to it from my PC, via Calibre. I almost never turn the WiFi on because it just burns up the batteries looking for a connection.
  
  When I do turn the WiFi on it seems to stumble all over itself trying to do something. It can take an hour or more, and often requires more than one hard reboot to get it working again. In my imagination it is telling Amazon, what books I loaded on to it from Smashwords. 
  
  According to Amazon.com Privacy Notice, they don't track anything from Kindle, but this seems unlikely to me. What information does my Kindle tell Amazon via the WiFi?
upvoted_answer: Hard to guess what information sends or what the device can do when connected via WiFi when this information is not open and probable it will not be. 
  
  Take as an example this incident( article excerpt/ my emphasis):
  
  
    Amazon Erases Orwell Books From Kindle
    
    ...
    
    Digital books bought for the Kindle are sent to it over a wireless
    network. Amazon can also use that network to synchronize electronic
    books between devices — and apparently to make them vanish.
    
    ...
  
  
  and also this incident where the account was also closed(excerpt/my emphasis):
  
  
    Why did amazon close a woman’s account and delete all her kindle books?
    
    ...
    
    According to Amazon’s terms of use, “Kindle Content is licensed, not
    sold, to you by the Content Provider.” It states that “Risk of loss
    for Kindle Content transfers when you download or access the Kindle
    Content.”
    
    ...
  
  
  This are by no means isolated, and are a far cry from the Privacy Notice you mentioned, and made me keep always the Wi-Fi off and backup my documents.