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The Case-Sticky-On External Battery is a great alternative to traditional power banks for smartphones. Specifically made to work with the iPhone 5, it comes in two parts. When a charge is not needed, all that is required is the initial covering that works as good as any smartphone case. When running low on power, it connects to the slim battery pack via magnets.

Sold online at Allputer, the Case-Sticky-On External Battery connects to the port of the iPhone via a cable. Available in five colors including metallic blue, vivid blue, vivid green, rose and gloss white, it also can charge the iPad 4, iPad Mini, iPod Touch and iPod Nano. Simple and convenient, it is a great tool to have on hand.