hi all...i have 3 Twists and two Joye Fast USB Chargers (500mah)...i bought a cheap usb wall adapter that is 5v 2amp but it has 2 usb inputs...when both are used it says it puts out 5v 1amp for each USB....my question is whether 5v 1amp is ok for the Twists to charge on, so I can charge 2 at once, or whether you need 5v 2amp for each while charging? Thanks for any help you can provide!