The key piece here is how to determine you are at 100% SOC per the battery manufacturers instructions. Using net return amps, at absorption voltage, (not float voltage) is usually the easiest method when out cruising. Here is a screen capture of the Lifeline Battery Tech Manual. I have highlighted the important part for net return amps determining 100% SOC.


It is saying;


A voltage limit of 14.3V to 14.4V should be used when the battery temperature is at 77F, this battery was at about 75F. When voltage is steady at 14.3V to 14.4V the battery can be deemed 100% full when charging current declines to 0.5% of Ah capacity.


When 14.4V and 0.525A were attained is when I deemed this battery at 100% SOC. Technically the battery was only at 95.69Ah so I should have used 0.48A but close enough for this experiment.