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Unexpected source of iPhone battery drain
Authored by: August on Mar 14, '12 09:04:08PM

My iPod syncs while unplugged. I uploaded to the latest IOS 5.1 before posting to test again, but it still syncs while unplugged from any power. So I don't believe the sync logic from Apple is working correctly yet.



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Unexpected source of iPhone battery drain
Authored by: August on Mar 14, '12 09:58:37PM

Ha! In doing some more research on the web, I found an article that contains a correction to the idea that wifi sync requires external power. Their correction is to note that only the backup to iCloud requires external power.
http://www.tuaw.com/2011/10/12/ios-5-features-wi-fi-sync/



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Unexpected source of iPhone battery drain
Authored by: kirkmc on Mar 15, '12 01:39:20AM

That's correct, but it syncs automatically when you plug it in. I see this when I connect mine to a charger.

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Mac OS X Hints editor - Macworld senior contributor
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Unexpected source of iPhone battery drain
Authored by: August on Mar 15, '12 08:18:18AM

It also syncs when you start-up iTunes. I found this to be a problem when switching between different iTunes libraries, only one of which I wanted the touch to be synced with. This was especially annoying when the touch was off in another room or was being used to stream Pandora to my stereo. My solution was to put the device in airplane mode while working with other iTunes libraries. Now that I think about it, maybe it is best for me to just disable the wifi synching as being inappropriate for my use of the device.



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