Tolino Epos 2 battery life and customization?

[Undr]

I have been trying to find some Epos 2 user reviews, but I haven't had much luck so far. I have an opportunity to buy one for dirt chear, but I've been reading about Kobo Forma problems (battery draining especially) and I'd like to know if any of them can be found on Tolino as well.

How long does the battery last if it's used without light or on the lowest brightness?

I'd only use it at home for studying languages, so it being on the powerbank wouldn't be a problem, but I'd still appreciate some authonomy.

Does the Kobo Forma sleep case work with Epos 2?

Lastly, I'd install Koreader, but from what I've seen, it's not as easy as with the previous models and there are some bugs/problems. Have those problems been resolved?