The iPhone 6 and 6s don’t have the amazing battery life of their plus-sized brethren, but this $21 battery case can more than make up the difference. To put it simply, this is the best deal we’ve ever seen on a current-generation iPhone battery case, and you shouldn’t hesitate to buy it. [1byone iPhone 6/6s 3100mAh Rainbow Battery Charger Case, $21 with code PAW7JLYD]

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