Flooded,AGM or Gel deep cycle batteries 12volt

harold1946 wrote:

One of the advantages with AGMs is that if they are fully charged and disconnected the only self discharge 1-3%/month, where wet cells discharge from 10-30%/ month.

While this is absolutely true, your wet cell numbers are too high for a HEALTHY wet cell that is fully charged.

It's more like 5 to 7%.
Anything over about 15% a month is a good indicator of significant sulfation and impending failure.