I kept an eye on the battery for 10 hours, and made this plot:
Needing to go to bed, I put the grid charger on a timer to run for 4 more hours, and the cooling fan to run for 5 more hours. I don't know what the final voltage ended up being, as I wasn't awake, but after 10 hours it was probably close, at 176.3v. In similar weather, my Insight's pack generally gets up to 170-173v, and I believe peak voltage is (somewhat) an indicator of pack health, lower being better. Still, I'll see what it does. Maybe I can get that to come down a bit after a discharge cycle.