I may be strange, but I pay little attention to the battery life of my e-ink readers. I only shut off the WiFi when I'm traveling or leaving the house with the device. I set the screen light the way I need it, and the same goes for the font size etc. I have no desire to shut off the touch screen on my Oasis. I rarely use the buttons, their clicking bugs me.
I use my Oasis every day, I may pick it up 15-20 or more times per day. I may read a few pages, or a few chapters, then out it down. If I want to send a book to the device, I don't want to have to dink with airplane mode. If I send books from my Amazon account, I want to wake the device up, and have them delivered, with no extra messing in the Settings.
I do change font and line spacing settings as needed, my vision fluctuates at times from neurological issues, so there is no ONE setting that always works for me.
My iDevices are in use daily also, and I also don't change their settings either, unless traveling. Even then, most of the places I take them have WiFi, and I want the device to connect once I'm there.
We have several multi-port chargers set up in our home. When a device needs charged, I plug it in. The only time I pay more attention to the battery life is after I send multiple books to the Oasis, to make sure no books are stuck indexing.
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