I have a lot of down time or you might call it enforced rest. I found this guy on youtube, he's a second career person who used to be a television interviewer. So his videos are pretty good.
This is the beginning of his journey with lead carbon battery chemistry. The benefits are claimed 1.5 hour charge time. Able to withstand deep cycling and being left at a low state of charge without sulphation taking place.
178. Installing Lead Carbon batteries (12V 100Ah) into my canal narrowboat -... (https://youtu.be/INOlnKXX5Yg)