We're excited to bring you the G-Max 20,000 mAh power bank. G-Max allows you to take incredible power on the go. Using the 87W SuperCharger (included in package) allows you to charge 5x faster than current "fast charging" 18W systems. 20,000 mAh is also the same size as 7.4 iPhone X batteries but only takes 1.5 hours to fill. Max Graphene. Max Power. Max Performance.