I want to connect my smart phone to the power socket on my 2012 R2100RT to keep it charged and not drain the batter when using it for music/gps when riding. I was searching here and saw a reference to a USB connector in the storage compartment of someone's 2011 RT but I don't see any reference to that in the manual for my 2012 (can't get to the bike right now to check). does it have one? If not, can someone recommend a cable? Is this a 'standard' power port or BMW proprietary? I'd like to use Amazon if possible, just not sure what to search for. Thanks!