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Car batteries seem to last 2-3 years in my garage, no matter the mileage/use/trickle charging that I do. From my '87 930, to the two more recent Honda daily drivers. I usually go with Interstate, AAA, or Costco batteries (all lead-acid).
I used to drive 14K miles a year on my Civic, with multiple long commutes each week. Now I drive a little more than half that (same car), with lots of shorter, 5-10 mile trips. No difference on battery longevity.
I've started throwing all cars and bikes on trickle chargers overnight once or twice a week to see if that changes anything. I'll report back in 3 years (or less).
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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