I have a 3215HST with just 44 hrs on it after about seven months of use. I lited the engine hood late yesterday just to do my routine check on the radiator screen and site check and clean the engine area. The tractors been working great, no troubles. However, I noticed that the brackets to hold the front of the battery down had come loose and the bracket had slid down the front of the battery. I also noticed some corrosion build up on the positive battery terminal. Today I pulled the tractor into the garage and removed the battery terminals to clean them and then reconnect them and put a little grease on the pos terminal connection. Then reattached the battery bracket and tightened everything securely. Filled her up with diesel and pulled her around back ready for when I need to use her again. Just wanted to give a heads up to those of you who have a 15 series that you might want to check these points occasionally. Glad I did.