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. Basically, you are able to juice up smartphones and other compatible devices without the need to tote around another cable, as all you need to do is pull out the retractable microUSB cable and get to work right away. A blue LED indicator will inform you as to whether the charging process is taking place, and it will also show off the current power level in the battery pack.

Not only that, you can also attach the Concord Keystone Keystone ECO Booster 2.0 to the back of a smartphone thanks to an adhesive gel pad that is concealed beneath a removable, snap-on protective cover. Whenever you remove the cover, it can be placed on the back of the unit in order to function as a horizontal or vertical stand. It will retail for $44.99 a pop if you are in the market for a new portable battery pack. [Press Release]

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