Some of you have posted about my batteries and the low voltage being the problem. I got it and thank you...I agree that's not ideal. But I also believe the Boost cycle (14.5 v) of my smart charger takes care of the sulfation on the plates and helps extend the life of the batteries.
The 14.5V absorption stage voltage is on the low end of many RV converters. It will certainly recover your battery charge if left at that voltage long enough. It does little to remove excess sulfation. An equalize charge of over 15 V is needed for that when batteries are fully charged.
Batteries have an expected life and it is ruled by amount of discharge and number of cycles at the depth of discharge. There are many resources to explain this and the battery mfg may have that information listed.
Battery University has an article on FLA batteries and how cycle life pertains to depth of discharge. There numbers are conservative but the relationships are sound.