Apologies if this question is silly or has already been answered (I did a bit of research and did not find any answers to my question).
I own the Nuforce ICon HDP and its need to use a mains plug all the time is a bit of a nuisance. I would like to connect it to an external battery so that it becomes a bit portable. Any recommendations? I have no knowledge whatsoever about electricity and physics (business major) so forgive my ignorance.