Mophie Powerstation Plus XL
secondary USB port to charge other devices
Screenshots
Hunter's comment
Mophie is an old favorite when it comes to portable battery packs and, while they tend to demand a bit of premium, you get your money's worth. PC World finds it as the most efficient battery they have tested. It also packs a convenient built-in charging cable with both Lighting and a micro USB adapter, along with a secondary USB port to charge other devices.
Link
http://www.mophie.com/shop/powerstation-plus-xl
Contributors
Hunter: @samsulzamar
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