Battery issue since new transmission installed

[jumpinjupiter]

I just had a new transmission installed under warranty. I got my truck on Wednesday and everything seemed fine. Friday morning woke up. Went to start my truck for work. It wouldn't turn on. Definitely a dead battery as it would not start at the end of work either. Went and got a new battery installed and all seemed good. Today. Ran some errands. Got home. Did some work in the house about 20 minutes later went out to my car. My car was completely dead. No honk, no lights, no unlock. No nothing. It was acting as if there was no battery installed at all. I ended up unwiring the battery and then rewiring it up and the truck started and acted fine after that .
I'm trying to figure out if I just didn't have the lugs on the posts right or if there's a bigger issue from the install of the new transmission? The reason I'm guessing possibly the lugs is I put the stupid phone things with the grease underneath the lugs and I noticed that the positive terminal didn't sit all the way down and didn't seem to want to tighten up right. When I took that off it sat lower and tightened better so that's why I'm curious but the timing is all a bit coincidental

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[Glocker]

Could be coincidental.
We bought my wife a used 2023 Bronco sport with 238 miles on it. After a couple of weeks it started giving signs the battery was on its way out. I told my wife to take it to the dealership and they were going to put a new battery in it under warranty for her.

Well they did, and drove it around for her to leave, and when she went out to come home, her little Bronco Sport wouldn't start!

They had to jump it off in the pickup lane and put another new battery in it as the new battery they put in it was bad already!