[JSWolf]

Originally Posted by misspelling

That's why it should support MOBI/EPUB and PDF. I think you can convert PDF to MOBI/EPUB. It would be more convenient if that would not be necessary, though.

Converting scientific PDF with multiple columns, math equations, and images to ePub is going to so much of a mess that it is not worth it. If PDF is your main format, then I suggest a tablet instead of a Reader.

I'd prefer AAA batteries because I tend to use my eletronic devices for a long time and in my experience the battery does not age well. I think newer batteries are better but as far as I know you still should keep them charged around 50% if you are planning to keep the device turned off for a while. If I use rechargeable AAA batteries I don't have to worry about the battery's life span. If the battery becomes useless I can easily replace it.

I have a Kobo Aura H2O that is almost 6 years old and the battery is doing pretty well.

I try to avoid WiFi, bluetooth or the internet in general to minimize the vulnerable of the device. I don't want to spend any time checking if there's a security update I need to install. And I don't want any unecessary hardware that needs to be powered and eats up resources. Especially if I can achieve the same thing by puting anything I want to read on a SD card or a flash drive that I plug into the device.

eInk devices are not really all that wonderful for web browsing or other Internet activities. YOu can leave the WiFi off and just use the WiFi to register.

The thing with an android/linux/windows device is that there're all those unnecessary tasks running in the background. I also don't want to deal with any app store or a million apps. The reader only needs to let me read what I put on it. The whole process shouldn't be unnecessary complicated. I feel like it's just cheaper to modify an android/linux/windows than to develop software tailored to the reader but I don't consider it to be ideal.

The two Readers I recommended (Kobo and Pocketbook) run Linux. There are no unnecessary apps running on them and there is no app store. Yes you can install 3rd party apps to these Readers, but you don't have to.

The avoidance of a touch screen was at the buttom of the list. I'd rather press a button that put my finder on the screen. And I probably could fix a button easier than a touch screen once the warranty expires.

The buttons will wear out sooner then the touch screen.

As for the Pocketbook Inkpad X, it does handle PDF pretty good and the screen size is 10.3" which you may find large enough to be able to read your PDF comfortably enough.