Was checking under the hood of my TC34DA this week and noticed signs of corrosion on the positive terminal clamp and the hold down bolts, mounting platform looked a little damp from a small leak also. Decided to replace battery although tractor was cranking fine due to close proximity to radiator and hydro cooler, Battery had a June 06 date code so 8 yrs. old. No complaints on replacing because battery has been trouble free during this time. Went to Advance auto parts web site and found a Group 51 500 CCA battery listed for 121.99. Found a $40 off coupon if you spent $100 or more online, ordered online and went to local store to pickup. Final cost of battery was 81.99 after core exchange + tax. Was just afraid to risk any further corrosion so close to radiator and oil cooler.