Delete comment from: Ken Shirriff's blog

Ken Shirriff said...

Hi Donnie! I'm sorry to hear that your charger isn't working. The problem is probably explained in the "Indicated charger type" section of the article, and footnote 6. Apple uses proprietary voltages on the middle two pins to indicate that it's an Apple charger, and HP uses different voltages to indicate that it's an HP charger. So the iPad can tell that it's not an Apple charger. One thing to check: does it still charge, even though the device says it isn't?

Jan 19, 2013, 4:17:39 PM

Posted to A dozen USB chargers in the lab: Apple is very good, but not quite the best