iPhone iPad Charging Voltages

Discussion in 'iPhone Accessories' started by SyBB, Aug 21, 2011.

  1. macrumors newbie

    Aug 21, 2011

    I cut a USB cable and used a voltmeter to determine the charging voltage for an iPhone 3GS, iPod 2 and and iPad 2.

    The USB port on Apple computers (MacPro and MacBook) put out 5.17 volts. Many of the third-party chargers from the far east (FE) put out 5.00 volts. When charging the iPhone, with the FE chargers I sometimes, but not always, get an error message indicating the the device is not compatible. This doesn't appear to be a problem with the iPod.

    Both the Apple and FE iPhone chargers are rated at 1000mA (1 Amp). Apple's iPad chargers are rated at 5.1 V and 2.1 Amps.

    Apple's iPhone chargers will charge the iPad, but very slowly because of the lower power rating.

    Hope that this helps.

  2. macrumors P6


    Jan 24, 2010

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