From USB power to battery power...

Discussion in 'General Electronics Chat' started by Marc0, Oct 25, 2012.

  1. Marc0

    Thread Starter Member

    Nov 28, 2011
    Hi, I have a little midi keyboard that is USB powered. It draws 5 v and 200ma ... I want it to be more portable and I was wondering if it's possible to supply the required power with a battery packet...and what size, eventually.
    The battery + and - could be attached to the USB + and -
    The USB data cables are unimportant, because the midi keyboard draws only power from it, not data.
    Is it doable? And how, practically?