If you have an Apple Watch, you have an iPhone. The Elevation Lab Battery Pro can keep them both juiced up. It has an integrated, MFI-certified magnetic Watch charger built-in, so there are no cords to lose and has a strap to keep your timepiece in place as it charges. There's an included cable for charging your iPhone, and with 2.4A output, it does so fast. Its 8000mAh battery provides over two weeks of Watch charges and over three days of iPhone use, all in a package that's roughly the size of an iPhone 7.