OEM batteries in both, cars parked outside all year.
I would expect minimum of 5 years with fuel injected cars.
My '97 has been in service 5 yrs 8 months (6 winters).
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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