Today, 19:08
Hello Aleatorylamp,
Battery installation is complete. Needed a bit of help from my Wife to get one of the hooks in place. Her eyesight is a better than mine and even in daylight it wasn't easy to put enough light where it needed to go.
I also found out today that the nuts and hooks don't really interchange well. They are supposed to be identical, but are not really. It probably explains why the hook in back did not stay in place last night. Every time the nut is tightened, the hook twists out of its hole in the battery tray. In the front position, it can be held in place. In back there is no room to get a hand on the bottom of the hook.
By the way, the temperature will get down to -3.9 Degrees C tonight.....
What you just described is basically all I am doing.