There are some things you can do to reduce battery usage if you are just going to read. Within the accounts and sync settings, uncheck Background data and Auto-sync. You can also set individual accounts there. Adjust brightness in the Display section of settings. Turn off wireless. There are probably other battery savers.
I don't routinely read on my Vox. I much prefer using my eInk device, the Kobo Touch. I was really surprised to discover this, btw.
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