Apple’s new MacBook Pros get high-powered USB ports; able to charge iPads

“Another little addition to the new MacBook Pros is that they’ll charge an iPad as quickly as the wall charger,” Seth Weintraub reports for 9 to 5 Mac.

The previous MacBook Pros offered 500mA available with another 500mA “Extra Operating Current,” but the new MacBook Pros now provide 1600mA “Extra Operating Current.”

Weintraub reports, “That combined 2100 mA of power is about the same as the wall power adapter for the iPad.”

Full article, with screenshots, here.

[Thanks to MacDailyNews Readers “Judge Bork” and “Sarah” for the heads up.]

7 Comments

    1. The energy supplied to the iPad battery doesn’t change. The rate of charging increases. So it will flatten your battery the same amount as before.

      This high power USB feature is likely intended to be used primarily when the Macbook Pro is connected to its wall adapter, the point being that you only need one adapter, not two.

      1. I’m afraid that’s not how physics works… The voltage may remain the same, but the rate of charge increases because the drawn current, and thus the wattage supplied and used increases. That extra energy has to come from somewhere, and if it’s not plugged in, that’s the battery.

        I don’t know what they will use for a battery now, but the last removable Macbook Pro battery was only about 6000mAh, meaning if you took it out of the computer and made a 100% efficient regulator for the high power USB port, it would last just over 2h, 50min at the very best. I think the newest 17″ MBP could manage a bit over 4h if the laptop drew no power whatsoever. To contrast, the battery that would last 2:50 would have lasted 12h powering a standard USB port in a similarly perfect setup.

        In any case, it’s kind of silly to charge a battery from a battery unless you’re desperate, since you’ll probably lose at least 30% of the power to conversion, which I’m not even taking into account here.

    2. Unless you’re talking about leaving the pad charged in until it’s fully charged, which is impossible with a current Macbook and USB port?

      I was thinking more that it’d be fine to give a device a little power by plugging it in while doing some work on the go, but it would suck if you stopped at a coffee shop or something, plugged in your iPad, and ran out of power on the computer, even though it’ll be several hours before you can get home and plug it in again.

      Like you suggested though, it makes more sense to only use this on external power, both to not crush battery life, and not to exceed the “C” rating of the laptop’s battery.

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