Well, it finally happened to me

[Stizzed]

I think it is overcharging voltage, too low capacity, and the parasitic drain. Mine charges at 15.4V which is more than any of my battery charges for a flooded battery. the AGMs charge at a higher voltage but still not 15.4v.
Flooded battery

AGM battery

Mine does the same thing. Currently running factory flooded battery, ForScan says SOC=80 and Type=AGM. This battery is now toast so Ive ordered an AGM. However, I'm very concerned with this charge voltage. Ive never (in 50 years) seen a charge voltage much over 14.8. Now Im looking to see if ForScan has a setpoint for charging voltage... The image shows me on the trickle charger. Took it off then started the truck. 12.6 on the charger @100% SOC, dropped to 11.5 @ 80%SOC, then started the truck and the DC to DC charger pumps 15.19 into it... <sigh>...

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