I have a L2550 that I inherited from my father, and I was just about to post a question about mine when I saw your post. The charging light has been on for years because the original battery was not replaced with a kubota battery which I think had an extra wire connection or something that is related to the charging light staying on when using a generic battery. I was going to ask someone if there is a way to hook that wire up somehow so the light will go out. The main thing I can tell you is I don't think you have anything to worry about because the light on mine has always been on for the last 15 years. Hope this gives you a little help.
