The Anker 737 Power Bank is on sale, Picked one up from Anker for $89 bucks, it is on sale at Amazon for $91 bucks, it normal price is $150. I also purchased its charging base. A friend of mine has both. He is an Engineer with GE and he works at jobs site around the country and basically lives in hotel rooms. He tells me this combination is great. The charging base recharges the power bank quickly and keeps both his company laptop going but also is personal iphone and MacBook. This is a upgrade for I have Anker's earlier Power Bank batteries. They are still going strong but the have the USB-A port and with most of my stuff now USB-"C" I have a cable issue.