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Anybody know what could be causing my iPhone to go From 100% charge to 30% overnight. It's been in sleep mode all the time. Is that normal?
asked Oct 9, 2010 by triuser (1,781 points)

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that is because you would have your bluetooth switched on.It drains battery faster so make sure you switch off bluetooth on iPhone when not is use.
answered Oct 9, 2010 by trianswer (22,754 points)