If you are camping on shore power, the converter will be at 13.6v. That would be too high a voltage for warm temperatures, and you will slowly lose some "water."
You could adjust for that by disconnecting the batteries and reconnecting, but that is not really good for them either. Batteries will last a long time anyway if you keep an eye on their water level. Some batteries also like an occasional deep cycle to keep them in good shape.
If you are on shore power and not using 12v things as when camping, the voltage will drop to 13.2v. That is good for floating battery maintenance at 77F, but too low if it is cold out.
That PD converter will give them a shot of 14.4 every so often while doing 13.2, which will help some in the winter.
IMO just leave the rig plugged in and let the "fancy" converter take care of the batteries. But do keep an eye on things. Trust but verify.
