Ill be getting a battery as mine faded during the tail light testing. Here is a photo of my battery after a day on the charger. Youll note that I am well below 12.6 resting voltage. Its kaput and I need to get one of the better units for the summer. It did last 8 years but has finally faded away. RIP.

Woody The resting voltage will tell you a lot - gotta be above 12.3 minimum.