I didn't drive it for two days, then today it started in the rain. I wonder why it is so random. The mechanic checked the battery. He owns the shop and it has been in business for 50 years. His great grandfather started the business. I trust him. The parasitic draw issue started 2-3 years ago (bad memory).
From what I have read about dead batteries & parasitic draws, ppl say to try to remember what changed in your vehicle immediately prior to the problem starting.
I had owned the truck for less than three months when I took it to a (different) shop. Can't remember everything they did. I'll find the receipt and check. I know they put in a new battery, fixed something electrical that was causing my turn signals to not work. Put in a new motor for the power window and reinforced the inside door panel. And repaired something on a rear wheel. They said when they removed the wheel pieces of metal fell out.
Six months later the truck wouldn't start. My son took the battery to O'Reilly and they said it was bad. To save me money, my son put in a battery from an old truck of his. His was rear post, so he had to get some type of adapter. The issue seemed to get worse soon after the battery switch. Then again, the truck wouldn't start BEFORE the switch.
Six months later it got really bad... repeatedly for days in a row it was dead in the morning. So I had it looked at (twice) when I bought new tires. They couldn't find the problem. That place referred me to a place that specializes in electrical issues, but I had no money. Soon after that was when the transmission plug blew out. It sat for 4-5 months until this last place. It drives better than ever.
It is curious that he recommended a large battery. Until it is dead again, I'm going to pretend that it is fixed