I'm thinking of something like this to mount on the handlebar or frame:
(Posting to save the link for reference.)

YermoI'm going with USB power (the only electrics I have use USB) and using the same weatherproof USB power that I mounted on the Ninja. I got it from a place that caters to Adv/Offroad and has lots of BMW-centric stuff. I'll dig up the link and post it.
Yermo My fave store for motorcycle electrical power stuff: BurnsMoto - Motorcycle Powerlet Dealer - USB power sockets, phone chargers, adapters, cables, batteries and electronics Fuel Pump Bypass Cable