Smart-phones are always getting thinner, faster and better equipped cameras, but what about batteries? With every process upgrade, and increase in RAM, there is a knock-on effect when it comes to battery life, and when you have a built-in battery like on the iPhone 5 this means carrying a charger and hunting for outlets.

But now there is another way. Mophie have just announced the Juice Pack Air for the iPhone 5 which gives the Apple smart-phone a 1,700mAh back-up battery, which wraps around the phone and doubles as a protective shell.

The Mophie Juice Pack Air adds up to 10-hours of 3G talk-time, boosts audio performance thanks to clever speaker redirection and is available in white, black or red for $100.

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