If you're only getting a day out of it I would switch it up one way or another. I leave my Wifi on sleep and even though it downloads a newspaper a day via wifi and gets a fair bit of reading it will last at least 4-5 days on a charge.
Personally, I might be tempted to do the upgrade to the Wifi (I have both orig and Wifi) if you afford it. Better display and much faster than the original. If you don't need/want the wifi part of it just leave it turned off.
Robert
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