Using a Mophie battery pack used to require that you always carried a microUSB cable in your pack, in addition to your Apple Lightning cable. Its new Powerstation collection supports charging the batteries via a Lightning cable so no you only need one cable to do it all.
Batteries are getting larger in smartphones and processors are getting more efficient, but people are also using their smartphones more so battery life is an important factor. External battery packs are capable of providing a significant portable power source to keep you charged up for days.
Mophie Powerstation Plus
While I was sent two batteries to test out with my iPhone X, the Powerstation Plus[1] was my favorite because of the blue fabric covering, integrated Lightning cable, and ability to charge up battery pack wirelessly.
The Powerstation Plus has a 6,040mAh capacity and weighs in at just 180 grams with a size of 130 x 69 x 15 mm. Mophie states it can add more than 20 hours to your iPhone X or five hours to your iPad 10.5. I used it to keep my iPhone X charged up for a couple of days while traveling for business.
There is a USB-A port on the top that you can use to connect your charging cable for your iOS, or other, device. Next to that is the Lightning input port that is used to charge up the battery pack. There is also an integrated Lightning cable that is stored around the outer edge of the battery so you can charge up the Powerstation Plus and use it for days without ever having to pack a cable along. You can charge up two devices at once by using the USB-A port and integrated Lightning