iPhone 3g USB vs outlet charging
by Justin Horn on Jul 29th, 2008 @ 1:31 amUPDATE 2 Charge test for iPhone 4
UPDATE USB vs outlet charging comparison now available here
I haven’t done thorough testing of this yet (hopefully I can do this in the not too distant future), but I have a feeling there is a pretty significant difference between USB charging vs wall outlet charging. I just plugged in my 100% drained iPhone into my USB jack on my computer and it showed it was charging with the big battery icon, but wouldn’t power up. I then plugged it into the wall outlet charger and it immediately turned on!
So I would suggest that if you are in a hurry for a quick charge plug it into the wall or car charger vs your computer.
UPDATE: Within 40 mins of charging on outlet it was about 80% charged and at about 90 mins it was almost fully charged
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When you totally drain your iPhone of battery, it will turn on only after you plug it in and it recharges for about a minute. During that minute, it is unresponsive. Voila.