Concord Keystone has just unveiled its latest Keystone ECO Booster 2.0 battery pack that targets smartphones from the Android and iOS-powered device categories. Being super slim and so light that you might not even be able to feel it in your pocket, it will carry 2,000 mAh worth of juice in a Li-Polymer portable battery pack. This ought to double battery life for most folks, and is also proud to be the only portable battery pack that comes with a built-in retractable microUSB charging cable.
Ubergizmo, Concord Keystone ECO Booster 2.0
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