My charger set-up
Part list:
[ame]http://www.amazon.com/Arkon-GPS-NHWC-Mini-USB-Hard-Wire-Cable/dp/B002GU60CE[/ame]
or
Google and type in gps hardwire and choose the one you'd like.
plus something like the link below (mini usb adapter) but for your phone or whatever else...search engines are your friend to find what you need...
Ziotek - USB Mini To 30-pin Charge And Sync Adapter ZT1900639 (190 0639)
Install Instructions:
Find your fuse box and put the bare end of the red wire under the fuse. I used the horn because, if it goes out, no immediate issues. Black wire needs to be grounded to your frame so find your favorite spot and do your thing. Run the mini USB end to where ever you'd like. The charger will turn on and off with your bike so no issues with draining your battery.
I use this set-up for my GPS, IPHONE and IPOD charger...one at a time, of course. I've been using it consistently for 5 months and I travel all over Germany/Europe with my GPS (or other device) plugged in all the time...no problems.
The main reason I went this route is to minimize on what I have to carry. I only have to carry one small mini usb adapter instead of chargers for whatever I may need.
Hope it helps.