I cleaned the corrosion up today with baking soda. There wasn't much on the D's battery but my CRX's battery was pretty nasty-looking, AFAICR I'd last had it replaced around 2012 and it was cranking pretty sluggishly lately so I just went and got a new one at AutoZone. The clerk talked me into getting the kit that comes with the felt washers and dielectric grease for the terminals so I put those on with the new one. I'll see how those do and then evaluate whether to do that when I put the D's battery back in.
I checked the D's battery with a tester today and it still showed good even after sitting for two weeks. I'll hook the trickle charger up tomorrow and see what it says. (It's the Centech from Harbor Freight (
https://www.harborfreight.com/automo...art-60653.html)
The D's battery is still on the kitchen counter because if the object is to get it out of the cold, my options are pretty limited as far as places the cats won't mess with it. There's a closet under the stairs in the basement but do I want it in that enclosed of a space?