Following with interest, thanks for posting. I bought used 2021 Yukon with 49K miles a year+ ago and when I first got it, discovered the battery pulls after only 4-5 days and when I tried to start.... it nudged/didn't start, but the electronics/messages on console when CRAZY!! Thought I'd destroyed the whole computer system - it was horrible, all over the place, and 2nd/3rd attempts to start with an inadequate jumper box only made things worse!
Now I use a battery tender all the time, no more low battery. TMI: I get 'replace battery' now and then on my FOB even though it's brand new battery but haven't been stranded yet.
And yes, I keep tools to disconnect the negative.... however, when I've done that (I put in a new battery) it goes into alarm mode? - horrible screeching noise for a bit.