I will follow along on this one. The last two years, I've just left the feeder in place, but pulled the battery out. I periodically put it on a battery tender. My water temp was about 45 when I went by the farm yesterday.

12 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs)
I think that's about all I should put in my little pond.
Otter attack in 2023.