In about 5 weeks, my '00 300m will be 11 years old. Technically I guess it's older than that by at least a few months, and so is the factory original battery.
The car gets driven every day - usually only a short trip (2 mile round trip - that's my commute to work). That plus some local shopping every few days, and about 6 to 9 times a year a round trip 200 mile highway ride. 97k miles on the odo.
Engine starts fine - just like it did when it was new.
I wonder if I should go another winter with this original battery... ?