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I keep it off on my Kobo as I have never synced the device with my Kobo account and only use calibre to add books to it.
I have Wifi on for my Nexus though as I use it to check email, etc. and can't be bothered to turn it off and on. I have to charge it roughly every other day, sometimes every three days depending upon how much I use it. So that's not bad to me.
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