Hi Steve, I think Ericb [excuse me if I'm answering out of turn Ericb] was referring to the left saddlebag.There's a factory USB port there for iphone/ipod/USB stick. Ericb made an excellent point that it may be used for charging a phone too. I haven't tried it on any other phone platform other than an Iphone, but if it charges any platform by USB that's a great tip.