First off you'll need a power connection, something like this should work fine although you might need one with longer wires: [ame="http://www.amazon.com/Battery-Tender-081-0069-6-Terminal-Disconnect/dp/B000NCOKZQ/ref=sr_1_3?ie=UTF8&qid=1404181614&sr=8-3&keywords=sae+battery+power"]Amazon.com: Battery Tender 081-0069-6 Ring Terminal Harness with Black Fused 2-Pin Quick Disconnect Plug: Automotive[/ame]
Then you can get an adapter, if you're looking for a 12v auto plug (cigarette lighter outlet) they make those but if you're just looking for a usb connection for powering a phone or something they make those too. This is the one I have, works great and is cheap: [ame="http://www.amazon.com/Battery-Tender-081-0158-Disconnect-Charger/dp/B00DJ5KEF4/ref=pd_sim_auto_1?ie=UTF8&refRID=140W25RHVF4N52H3FF1K"]Amazon.com: Battery Tender 081-0158 Black Quick Disconnect Plug with USB Charger: Automotive[/ame]
You connect the first item to the battery then route it to wherever you want it to go (mine goes to the handlebars) then plug in your adapter. Piece of cake.