With a newer Android version, I would totally use it as an audio player

I like a cool and weird piece of tech here and there, but the whole concept of an e-ink smartphone kinda screams “KILL ME, PLEASE!”. The only upside here is that it drains little to no energy in standby, but other than that… Reading is pretty much defeated by the size of the display, using it as a smartphone – by the response time, and, to some extent, by the lack of color.

What’s the battery life?