[high_climber]

I have a 2017 SS 1LE that I have driven 4800mi in its first year. Twice now I’ve gone out to the garage and it’s been dead as a door nail to the point I couldn’t even jump start it. Chevrolet replaced the battery twice under warranty after towing the car in and testing it for a drain-can’t find one on their diagnostics. I originally put in LED reverse lamps with the .5ohm resistors around the plug as suggested to eliminate ghosting and have removed them on the suspicion they were the problem.
I have the car hooked up most of the time on a battery tender junior through the forward remote terminal access point under the hood when I’m not driving it during the week as an extra precaution. Car never goes more than two weeks without driving and I’ve noticed when I hook it up on the tender the light on the tender goes red (indicating the battery is under 80% charged) every time. My other cars flash green until it goes steady within a few hrs indicating they are starting with at least 80%. Any ideas would could be killing my batteries???

The dealership is basically saying they won’t replace another battery and are assuming it’s something I’m doing wrong...very irritating.
Thanks for the help, here are some pretty pics for reading