My Kubota is 5 years old. More than I get out of any car battery. I went Kubota to see how much their battery cost. It seems to be still working well. They told me that most of the reports Kubota batteries are lasting about 10 years. If you are starting in winter weather, might use the tender (I am going to start doing that) and might consider adding a plug in block heater. I had one put on my tractor -- but haven't used it yet. As Jeff said, and I'm sure you know, starting a cold engine in cold weather can hit a battery pretty hard.