Winterizing 2018 GS20 (ZR4) - Need sanity check

[ecod33]

This is our first winter with the GS20. The boat will be stored under cover, out of the weather, but it definitely freezes here. I THINK I’ve done all the proper steps, but would love some feedback to make sure I’ve not missed anything. Here’s what I’ve done.

Motor - Aside from everything listed, I also have a Pali engine compartment heater that will stay in all winter.

1. Removed all 7 drain plugs and drained water.
2. Dropped one of the plugs into the bilge and spent 30 min trying to find it.
3. Replaced all 7 drain plugs
4. Cleaned/drained raw water strainer, then filled with RV antifreeze.
5. Sucked in 6 gallons of RV antifreeze into the main intake next to the strainer. (AF definitely coming out of the exhaust)
6. Re-removed all 7 drain plugs and left them out. (AF drained from all 7 plug locations)

Heater

1. Removed the upper heater hose from side of engine.
2. Used 35psi air to blow out ALL water/antifreeze from the heater lines.
3. Replaced the heater hose.

Ballast

1. Removed each intake hose, one at a time.
2. Sucked 2 gallons of RV antifreeze into each of the ballast tanks (port/starboard/center)
3. Replaced the hose for each tank.
4. Drained each tank for about 2-3 seconds each (leaving most of the 2 gallons in each tank)

That’s it so far. I need a suggestion for the batteries. Not totally sure what is the best charger for them. Also, do they need to be disconnected completely?

Thanks in advance!