In this image we can see, at 49% SOC based on Ah capacity, the resting open circuit voltage has rebounded to 12.32V. If you had been using my customers chart for resting OCV you would have mistaken 49% SOC for 70% SOC.


With this it's easy to see how battery assassins commit murder without even being aware of it. Use voltage carefully if you plan to use it to predict SOC.

Good luck & happy boating!