All eink readers have decent battery life, though I read here that the Android type have shorter life than Kobo/Kindle/etc.
I don't know of any ereaders that have an always-on (un-disable-able) wifi connection (just turn on airplane mode) or that cannot have books sideloaded. Would you need to load the epubs as epubs only, or would you be able to convert them (i.e. they are not DRM locked etc)? If you are able to convert, even Kindle isn't out of the question, as your SD card criterion is listed as optional.
What country are you in?
Are you aware that eink readers are in the main more fragile than tablets, and will need to be treated a little carefully?
Do you require a lit screen?
Last edited by meeera; 06-25-2017 at 10:28 PM.
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