I'm almost feeling uncomfortable! Lol, what if I give you bad advice.. From what I understand all usb hubs are a standardized 5volt,,,no problem interchanging. It depends on the amperage. A single 2 amp adapter will charge any bat that I know of. Some just may take longer to charge the battery. The adapter relies on the charger to limit the amperage. So your eGo charger should only take what it needs..
Anyone else care to chime in? A second opinion would be nice just in case I give poor splinter here bad advice