Mophie’s newest backup battery, the mophie juice pack powerstation® duo, can charge almost any USB-chargeable device. It has a 6000mAh battery and two USB ports for charging two devices at once. It can deliver 2.1A, so you can even charge a tablet while you charge another device (but not two tablets at once). It measures 2.28″ X 4.30″ X 0.78″ and weighs one pound, and it has a black soft-touch exterior with a metal band around the sides. The juice pack powerstation duo charges via USB, but it doesn’t do pass-through charging. You can recharge this juice pack 500 cycles. The mophie juice pack powerstation duo is $99.95 and is available now from mophie.
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I have this. Works great.
http://www.amazon.com/5000mAh-External-Rechargeable-Battery-Android/dp/B00852Y722/ref=sr_1_2?s=electronics&ie=UTF8&qid=1339910935&sr=1-2&keywords=Vaas+5000mAh+Dual-Charging+Battery
but go here for better buy.
http://www.icemonkey.com/vaas-5000mah-dual-charging-battery-pack-for-apple-devices-mobile-phones-and-micro-mini-usb-devices-choice-of-black-or-white