A few years back while working in a Ford dealership I too was amazed to see a customer trade in a 12+ year old car on a new one and discover he still had the original battery in it and performing nicely. Only one I ever saw that beat that was an elderly gentleman who had purchased a surplus police cruiser with it's original battery. At age 20 the cruiser's battery finally died. Definitely the exception and not the norm.
2001 CC LS, pewter, stock, 4.3,Wait4meperformance, CFM throttle blade, Helix throttle body spacer, 4spd auto, 3button electric 4x4 shift, heavy duty factory suspension, Bilsteins, 1" rear wheel spacers, skid plates.