If your battery is around 70% charge rate you will get a yellow battery icon that will show up in the cluster sometimes when you shut the car down. Usually when you start to get to the volatage limit the clock and date will reset and the defroster in the rear will stop working. When you go beyond that yes you could have issues with the rest of the electricals in the car. If you know it needs a battery already then just start with that. No point in trying to chase something on this car if the battery is bad you will run around in circles.
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