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I get at least an extra day out of a charge when I turn off WiFi while I'm at work (I'm behind so many filters I don't want to go through that network anyway). When I get home I turn it right back on. So it does help, in my experience.
 
I have wifi on at all times while im at campus and it doesn't seem to hurt my battery life to much at all.
 
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Funny stuff Voo.

I just got my refurb a few days ago and it seems to have about 70% left when I plug it in for the night. Thats with ~15 min of talking and a lot of surf time.

I just checked my screen brightness and turned it way down. Thing was nearly hurting my eyes.
 
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