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This is why it kind of troubles me. I actually did have a battery replaced sometime early 2016. It is a different battery than the stock BRZ one IIRC than the stock one and supposedly has more cranking power at 750?
I have a feeling it is the alarm system and the keyless entry. From what I understand, the proximity key sensor is always on and when any key (from any car) comes near it draws a bit of charge to read it. When the car is parked inside beside another frequently used car with proximity key, that could be why it drains the battery?
My confusion of posting this, is that the battery seems to always have more than enough juice to power everything else but can't turn the crank... It's almost like the battery needs to be at least 90% full at the time of crank so it reaches the state of "still a lot of juice but just can't start the car" really fast... I find it very hard to accept.
Either way I will try the battery route first.
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