I have been having trouble starting my car (needed to jump it twice, once in the morning, and once in the afternoon). Sometimes it would make a clicking noise when trying to start or it would be silent. Using a multimeter I checked the following voltages on the battery:
Car Running: 13.5 Car Off: 12.5
I disconnected the battery overnight to see if there was a drain, but the car still wouldn't start the next morning. I checked the voltage and it started at 11.3 and creeped up to 11.5 as I left the multimeter connected.
Any idea what could be wrong? Is it a bad battery? The car is a 2008 Pontiac G6 and the battery was purchased in 2011.