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Starting in 2017 forward, Subaru stupidly programmed the car to let the battery discharge during acceleration and stops, doing most of the charging while decelerating only. I discovered this when I parked to listen to the radio for an hour and the car would barely crank. They said it's for "economy" B.S.! This will ruin batteries faster. You can force the car to "normal charge" at 14.2V by turning on the running lights (I drive with them all the time now). Also, if you turn the fan on it will hold at 13.3V. But drive normally and watch the voltage drop from an initial 14.4 at start to around 12.1 in just a few minutes. More on this later as I'm working up a big expose.
I'm an Engineer, I like to measure things.
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