2006 Ferris IS 1500 21Kaw 48". 5.1 hrs. dead battery. Dealer provided demo, replaced battery. 8.0 hrs. dead battery. dealer provided demo, replaced stater. currently 9.8hrs. dead battery. going to the dealer today. Dealer response has been great, but I am still PO'ed. This is my first comm. mower. Would like to know how you guys would handle this situation. Thanks.