It's brutally cold in the midwest and my little brothers 2019 Compass wouldn't start yesterday. There was still life in the vehicle, but the voltage was low and forums seemed to suggest the batteries so I decided to replace both. I did the work myself and although I'm no mechanic, I work on my own BMW and have replaced dozens of batteries so I feel confident that it was done correctly. Still no start. One weak click and error messages for dynamic steering torque, ESC, and parking brake. Any input on fuses or other things to look at would be greatly appreciated. It has around 80k miles and I believe the AUX battery was replaced in 2020/21, but the main battery was original.