Practically speaking, I would not want my lead-acid battery to go below 12.0 volts after waiting 8 hours since charging, to insure that surface charge dissipates.? But keep in mind that using voltage to determine state of charge (SoC) is a very rough and inaccurate way to measure it.? If you’re really interested in charge state, you’d need to install a device called a Coulomb Counter, which counts the passage of energy to and from your battery for a nearly exact determination of SoC.? Here’s the one I use:

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Dave

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Does this mean try not to let the battery go below 12.2 volts under charge or after resting?