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Just replaced the 9 yo battery in my cayman pre-emptively. Usually I let them die. Only get about 3 years out of my daily drivers that bake in the sun outside and have battery in the hot engine bay.
I think its cheaper/easier to just keep a 49$ lithium jump start pack in the trunk and run em til they die at least for cars old enough to have manual trunk pops. Bonus if you get the lithum pack with built in inflator since slow leaks get me more than batteries.
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84 930
18 Cayman GTS
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