Wh of my external battery (flight regulations)?

Discussion in 'iPhone Accessories' started by johannnn, Apr 4, 2015.

  1. johannnn macrumors 65816


    Nov 20, 2009
    I recently purchased a battery pack while on vacation in China.
    When checking in on AirChina they claim "capacity of the lithium ion battery shall not exceed 100 watt-hours" (http://www.airchina.com/gr/en/trave...on/baggage_information/baggage_checked5.shtml).
    This extra battery comes in 10400 mAh. I assume it's well below the limit, but I would still like to know the exact number just in case.

    Does anyone know how I convert this mAh to Wh?
    Googling says I should multiple with the voltage which I don't know (iPhone 5, 6 and iPad mini retina if it matters)
  2. PsyOpWarlord macrumors 6502


    Nov 11, 2010
    Colorado Springs, CO
    If I remember ..

    USB is 5V
    If your allowed to have 100Wh then:
    mAh = Wh × 1000 / V
    100Wh x 1000 / 5V = 20,000mAh

    Since you're below the 20,000mAh for a USB charger you should be fine.
  3. maliu macrumors 6502a

    Jun 24, 2010
    Carry it with you, don't put it in your checked luggage.

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