by Joe White
July 9, 2010
When Will Apple?, in which the charging times of the iPhone 4 via USB and outlet are directly compared in an attempt to find out which is the quickest - and by how much. A series of test conditions were established, and readings of the device were taken every five minutes. The results highlight what we'd expect to hear: charging the iPhone 4 via USB takes longer, but the difference between USB and outlet is a massive thirty minutes - 23% longer to get full charge when charging via USB! You can check out all the information about the test below, including a graph displaying the differences discovered. The conclusion this experiment brings us to is simple: charging via USB is convenient, but if you've got a wall outlet handy then always opt for that. Read on to find out more about the test. Test conditions
- Started with completely dead iPhone.
- Wall outlet: standard US 120V / 60HZ.
- USB charged on late 2008 13" aluminium MacBook.
- iPhone was checked quickly, 1-2 seconds of screen time, every 5 minutes for its current charge - therefore minimal impact on charge time.
- iPhone screen kept to a very dim level.
- Wi-Fi off.
- iPhone 4 was active on AT&T 3G during charge. Activity on the phone included;
- Outlet test: 2 texts, 1 phone call (cancelled), 1 voicemail.
- USB test: 1 text.