[WindowsCentral.com]

Leaving home while your phone's battery is almost dead doesn't have to be a crisis. With RAVPower's 16750mAh Portable Power Bank, you can charge it back up on the go and have plenty of juice left over to recharge other devices too. Though it's normally sold for $36, Amazon is offering nearly 60% off its regular price when you clip the coupon on its product page and then enter promo code 50W5C77D during checkout.
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Full story from the WindowsCentral blog...