Designed with portability in mind, it’s easy to put in a backpack or even slip into a pocket (for short periods of time). A power button sits just above four indicator lights. On the front of the pack are two ports: one B-C B-A. The B-C port provides quick charge capabilities on the xel X The B-A port offers the same, but stops short of bringing Quick Charge 3.0 to the G5. Recharging the pack is done through the B-C port, with the total time to charge its 10,000 mAh (36) battery coming in just over three hours. As far as an efficiency rating goes, the iVoler performed very well in our testing, at 91.67 percent. In other words, we were able to get 33 out of a possible 36 from the device. ed, this isn’t the biggest battery available, but it’s more than enough to recharge a smartphones few times during the day or on an overnight trip in the airport. en you combine overall size with its overall efficiency, the iVoler Type C wer nk is the best portable battery pack we tested. Included in the box is a B-C to B-C cable, a B-A to B-C cable.