I have a boox device (go Color 7 gen 2) and the battery life is not good for an ereader. For a tablet, it's fine I guess but I actually get more battery life from my actual tablet than this little ereader.

it lasts a day if youre reading all day, a couple days with lighter use. I couldn't finish a whole book on a single charge even if its a small book. Not at my reading speed anyway.

As a comparison, I've already read 3 books on the xteink x4 and still have 60% of battery left. So yeah, android is good but these things need much better batteries to compete.