Changed the fuel in our '03 Thunderbird for winter storage today. It's always on a Battery Tender but this time it cranked slowly but did fird and ran a bit to circulate the new fuel. No such luck when trying to restart it to put it back in the garage, Oh, dead battery. Then I looked in the maintenance records and the original battery that Triumph provided in 2003 lasted 2 years. This deceased Westco Sealed battery that replaced it was put in service in May 2005. That makes it 14 1/2 years. Yea, Westco Battery and Battery Tender!