My Equinox has had 2 battery failures.
Both instances the vehicle showed no symptoms. Working fine. Starting right up.
And suddenly CLICK CLICK CLICK.
The most recent one, I thought it was a bad terminal, as there was corrosion.
I cleaned it up and it started fine for a day and a half. Multiple engine starts.
The next morning- click click click.
The vehicle reports no alternator/charging issues via the dash.
Put in a new battery and its been working fine now for 27 days.
2013 Equinox LT1 3.6L V6 FWD 88,000
2010 Traverse LT1 3.6L V6 FWD 153,000
2003 Trailblazer LS 4.2L I6 RWD 181,000