Kobo Aura One vs Onyx Boox Note 3

Instead of going small with its new top-of-the-line e-ink e-reader, Kobo's gone big. The Aura One sports a 7.8-inch screen that's significantly larger...

3' size, my suggestion will be to go for Boox Note 3. Even though Note air is also a great option in that size, I won't recommend it for your use case because you said you will use it on the go a lot.

I plugged it into the charger for more than a day and it wouldn't charge! I found out that yes, the battery can be replaced but it needs more sophisticated electronics skills than I possess. I'm glad that I was able to use it for the time I had it, but I think it should have lasted more than two years! Or at least they should make the battery replaceable., or provide a replacement service. I would not buy one of these again

I now carry only this, not a couple of paperbacks, a notebook and a pen. The battery life is phenomenal! I read 3-4 hours a day 5 days a week with frequent interruptions (work, what can you do?) so it often powers off and the battery is still 50%-60% at the end of the week! The ability to change the screen lighting makes it easy on the eyes, the bluetooth connection works well with ear buds but I've only been able to bluetooth tether it to my phone once. The Wi-Fi tether works like a champ every time. My only "complaints" are: 1) setting up the google play store (for the nook and Kindle apps) is frustrating if you don't, as I did not, read the instructions (the reboot is, in fact, necessary!) 2) Every time I would tether the device the location would automatically turn on (this has been alleviated with the latest update but contrary to the update notes, location is NOT turned off by default