Quote:
Originally Posted by MRCA1ST
+1, definitely seems like the battery
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This was a huge issue I watched closely a couple of years ago. It has slowed way down from what it was since most of the batteries have probably been replaced. When I was keeping track there were about 10 BRZs with the problem for every FRS that had it. Since there were about 100 FRSs for every BRZ at the time that difference is much larger than it seems. They both had the exact same battery so there is something about the BRZs that was drawing amperage. Many of the cases showed the battery to still be at the proper voltage range but they simply did not have the cranking amps to turn the car over. In ever situation where the person updated after getting a new battery there was never a reported return of the issue. There were a few theories at the time but I don't think we ever came to a final conclusion.
My 14 FRS still has the original battery and after 4 Canadian winters still cranks the car like it did when it was new. A while back we had temperatures of -10F for a few days and even then it worked as if it was August.