Microsoft's Portable Power DC-21 - the 6000mAh mobile battery pack that it launched last year for $49 - is now on sale for just $24.99, and is currently available in white, green or orange.
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Most of us have, at some time, found ourselves with almost no battery on our phones, and far away from a charger. This 11,300mAh portable battery from Samsung will solve that problem nicely...!