When it went stupid cold a week or so ago (2*) CKW's Acadia would not start, and the battery is 1 month old as to install date. 10 minutes on the charger and it lit right up. Been fine ever since. I put a meter on the battery, and it showed 11.5V before the charger was hooked to it.Thing is, no one really knows how long they sit on the shelf before you buy it.
Mine acted weak after sitting a couple of days last week in the cold. It's on its way out.
These new cars never totally shut down. The ecu continues to process.