iPhone accessory maker Mophie has released the second-generation of its Juice Pack Universal line. The 3 external batteries are designed to recharge iPods and iPhones, and for the largest model, the iPad as well.
The Juice Pack Reserve is very small and shaped like a Zippo lighter and has a 700 mAh battery. It plugs directly into the bottom of the iPhone or iPod Touch. The Reserve is available for $34.95.
The Juice Pack Boost doubles as a stand for the iPhone and has a 2,000 mAh battery and can completely recharge an iPhone. The Boost is $49.95.
Finally, the Juice Pack Powerstation is an iPhone-sized battery pack that can charge the iPhone, iPod Touch or an iPad. The Powerstation can also charge other USB-powered devices as well. The Powerstation has a 4,000 mAh battery and is $79.95.
Mophie's juice pack batteries are available at Apple Retail Stores and at Mophie.com.
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Also, there are many promotions where you can get it for half the price (around 50$).
Trent 5000mAh External Battery (http://www.amazon.com/gp/product/B0013G8PTS/ref=as_li_ss_tl?ie=UTF8&tag=onlineforums-20&linkCode=as2&camp=217145&creative=399369&creativeASIN=B0013G8PTS/)
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Thank you! Just bought it - love that it works with Kindle too.