Motorola Power Pack Slim 5100mAh Portable Charger with Built-in Micro-USB, 2.4A Use the built-in micro USB cable and USB port to charge two devices at once. With a whopping 5100mAh battery, you can fully recharge a smartphone and still have power leftover for a tablet Ultra slim design lets you slip it into your pocket and take it anywhere. Motorola Power Packs are compatible with Android and iOS USB-powered devices. Weighs just 5 oz.