Sticker shocked once more. I used to pick up a 12-v "garden Tractor" size battery for $20-25. They might last a year or two, then I'd get a new one - no big deal. Recently after moving and taking a hiatus from running the tractor - a Gravely G16 Professional, I paid $55 for the same wimpy-looking battery and it only lasted a year. Got another one for $55. IT lasted a year. They look like the same thing I used to get, something that looks like it should go in a Barbie mower, but this is getting expensive. In this tractor I have the room to put in a regular car battery. I figure I might pay a bit (but not much) more, and get a lot more oomph and longevity out of it. Is there any downside here? What am I missing?