16.2 volts is the recommended Equalization voltage of flooded deep cycle batteries( Trojan and Rolls Surrette), at 77F.
An Equalization is a forced overcharge to revert specific gravity of the electrolyte back upto maximum density across all 6 cells of a 12v battery, if possible. It is not always possible if the sulfation is hardened.
While it is a necessary procedure on a abused deep cycle battery, whose plates are thicker and denser, it is still abusive to the battery and should not be performed unless required.
Required is determined by using a hydrometer, and after several hours of holding the battery at ~14.7v does not get the specific gravity up in the 1.275 range, or the 6 cells ranges vary more than 0.015 or more.
EQ charges are likely more abusive to a starting battery whose thinner plates are less dense and more fragile.
If you want to use the power supply as a maintainer, power it for 10 minutes a day on a timer. But the power supply could also present a parasitic draw on the battery when not powered via 115vAC, negating the usefullness of this approach.
One could add a Diode of adequate amperage which would lower the max voltage, and prevent the parasitic draw. Could be a fun proiject to keep the electronics out of a landfill, for a while longer.