I have a 2008 Sportster 1200c. At around 500 miles, the battery was dead. Hooked up to HD Supersmart Battery Tender - for a couple of days - no dice. Harley came and picked up and about a week later had it running - they were not clear in what they did. I was concerned that I saw corrosion on the fuses and relays. I mentioned it to the tech and they said they would take care of it. Now I am at around 1200 miles - I was getting ready to bring in for 1000 oil change. I hadn't ridden bike for 4 days. Battery dead again. Hooked up to charger over night - did not charge up enough to start. Contacted Harley - they were going to pick up - then it got delayed. I was annoyed so went and go cleaner and Dielectric grease. I pulled fuses, relays and cleaned connections and contacts (and battery terminals) I greased and tightened everything. I set the bike up on the charger. One day later - seemed to be holding better charge - but not enough to start. Second day, when I flipped the run switch, the injector actually kicked in, but not enough to turn over bike. Later that day - charger went green - so I thought I would try to start. Injector worked, bike turned over - had to do a couple of times to get started. I rode bike around for about 45 minutes. I turned it off, and it started again - not a quick turn over, but eventually. The only mods I have - relocated tail lights, and added HD remote garage door opener kit. I also cleaned corrosion and grease fuses, relays, and terminals. So my question - Is it normal for battery to go dead if the bike is not used for 4 days? Could this have happen because of corrosion - read a couple of things on net that led me to that? I am still bringing in or HD to do oil change, but I am disappointed that this happened twice on a new bike. Thoughts? Input? thanks.