Image: iPhone 4 Charging time   Wall Charger Vs USB Charger

This graph shows how long it takes to charge the iPhone 4 via the wall charger and the USB charger!

Stating the obvious, the iPhone 4 takes longer to get a full charge on USB than an outlet. What you may not have realized is how big the difference was, an extra 30 minutes! That’s 23% longer to get a full charge on the USB. If you’ve ever had a completely drained iPhone, you know it takes a bit of time before it turns back on. Plugged into an outlet, it took 3 minutes 11 seconds to come back to life. On USB it took almost 2 minutes longer, 4 minutes 49 seconds.

[Via]





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