Mine goes dead after 4-5 days of no riding. After I get back from England I'm going to order the 12v outlet kit and a 5 watt solar charger for my bike. All I have running is the clock, but that shouldn't be causing the problem. I haven't put a meter on the fuse block yet to see what is drawing it down.
Due to no garage and a shed full of tools, I'm forced to park on the back porch under a 4ft overhang. It's mostly out of the weather and I cover it if there is going to be rain. I can set the solar panel with a good southerly exposure and plug it right into the 12v to keep the battery topped off.
Anyone using a solar charger? I was thinking about this one...
http://www.amazon.com/Sunforce-5002..._8?ie=UTF8&s=automotive&qid=1227578520&sr=8-8