Nissan diesel lets me down first time ever.

Nissan diesel lets me down first time ever. After being parked for many days at -20 to -35 degree temperatures It was time to go home. Sweep off the snow and to my surprise the old girl didn't fire up! I'm wondering if my batteries are weak, or maybe a couple glow plugs not working after 35 years? Had to boost it before it would fire up which is a bit of a pain being 24 volt system instead of the regular automotive 12 volt. Last year it was WAY colder & started up for me. Here's the link https://youtu.be/vKaMtXih-cM?si=6wROKqb9Ou6kZvvj