I'd like to be able to charge two or more intellicig evo batteries (m402 size) at the same time without using the laptop. I've seen a few fairly cheap (just over £5) dual mains usb adaptors but I'm not sure if they have enough power (the evos charge pretty quickly using intellicig's mains usb adaptor but a dual's no good if I have to wait twice as long for them to charge). Anyone know what power's required or already has something they can recommend?