May 2007 I bought a new 2305 John Deere. I like this tractor and use in daily to weekly in the summmer, weekly to monthly in the fall/winter. Winter 2008, I first experienced that it would not start.....I got nothing and the dash lights I recall were dim. The only way I was able to start it was with the help of a battery charger in "Engine Start" mode. If I went out the next day, it would start right up but if I went out a week later.....I got nothing. In May 2009, just before the batteries 2 year warranty, I brought it in, they bench tested it and it tested fine. I reinstalled it afterwards and I continued to use the tractor 3 months straight on a daily schedule without any issues. I let the tractor sit straight for 2 - 3 weeks in September and went to start it.....I got nothing. On October 15th, I had the dealer out, they checked the tractor out and installed a brand new battery. Tonight I went to start it...I got nothing. What it draining these batteries down? I leave lights and ignition off. Is the alternator functioning properly? What things can I check? Any advice/suggestions would be great.