Well, the Apple wall charger states that it is rated to 1A, and USB is (from what I can tell with a quick search) limited to 550ma, so I would have to conclude that the charger is capable of recharging the iPhone at twice the speed. Now, this also depends on the iPhone's charging circuitry - does it perhaps limit the maximum charging rate - but at any rate, the wall charger would certainly be as fast as the USB port no matter what.
I don't know if this applies to the battery in the iPhone, but it does to other rechargables. Faster charging usually means more heat, and this tends to shorten battery lifespan (by lifespan I mean the total number to charging cycles). I would imaging that I'd trickle charge as much as possible using the USB (given a choice),
Hmm... i downloaded "Battery" as well and it shows 1000mA when plugged in the wall and 500mA in my computer.
I am using the power cord that came with the iPhone.
What is everyone else getting in "Battery" when plugged into the wall vs USB.
Which (if either) is better for the phone?
Recently my iPhone wont charge to 100% (91% highest). I try the whole drain completely and a full charge technique, no help. And it doesn't matter if i am on 1.1.1 or 1.1.2 or 1.1.3 (which i am on now). Anyone else have this problem?