[cmiovino]

I saw this thread pop up with activity and it caught my interest moving to STX next year for autocross... and having a battery from 2019 right now. Looks like the stock battery in my 2017 was replaced in 2019 by Subaru right before I got it. Subaru's batteries have gone downhill since the mid-2000's when I regularly saw the Panasonic ones they used last 10 years.

I will give my experience with the Braille 22lb battery. Had it my WRX when that one needed a battery. ~$200 at the time back in 2018. I was skeptical going from a 40lb stock battery to this 22lb one would be reliable in the winter, but sure enough it started the car reliably at even 10 degrees F. I'd probably go with a 5-10lb version from Shorai or other manufacturer this time. Nothing against Braille though.

For anyone looking at these lightweight batteries, don't think you're giving up much if anything. A lot of the CCAs these are rated at around 550, which is right in line with the stock battery. Not sure I'd run a 5lb mini battery in the dead of winter, but you'd more or less fine down to about freezing I'd assume.