Hi Gary, hope you're keeping well. Battery wise (for the op) I fitted the one in the pic & it has been great. If I'm not using the D2 for a week I plug in my solar panel via the OBD port (both from Halfords) & stick said panel where the sun shines in the the most
. I also bench charge it every 6 months on my Ring intelligent charger for 24hrs. On the NOCO front I got the GB70 which I used a lot initially as the truck had a dodgy battery on it when I got it (as a lock down project in June 20) & I didn't want to splash out on a new battery until I knew where I stood with it, again the NOCO has been great to this day (not needed on the D2 obviously) on other vehicles as I always carry about with me, all the best.