A concerned multi-iPhone owner has taken it upon himself to test the two primary means of charging the iPhone 4, AC outlet and USB port. The test wasn't executed very scientifically, calls came in as well as text messages, while the test was going on. The results are however fairly interesting and by interesting we mean obvious. The AC adapter, having a near constant and regulated high current charge, beat out the 2008 laptop. The only real surprise is exactly how wide the variance is, 30 minutes longer than the AC's 130 minutes. This is at least good to know if you are about to leave and need to get as much juice as possible in a short period. The knowledge of just how large the difference is, should help guide others to better choices.
One thing to note, in the past few years, Apple has increased the power output to its USB ports. Most notably to
iPad owners who cannot charge their iPads from anything except an AC outlet or a new Apple laptop/desktop. We'd be willing to guess that new Macs would charge faster than the old ones. Hopefully someone takes on the challenge and tests that theory.
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