That's what I was thinking. I don't think it's right for a car to sit on a trickle charger because it dies. My folks have a 2018 Mercedes Benz E class which has way more electronics and it sits for about the same time my BMW does (1-2 weeks) without being driven. It starts right up regardless. I'm gonna let the car sit without a charger and see how long the battery last.I’ve let mine sit for months at a time in a 4.5 year old battery and t starts instantly. My folks leave their VW for 6 months, no issue starting. If you sit and drive only a couple miles, especially with various heaters on, yes you’ll see low voltage issues, but I’ve seen those issues while driving, not after sitting.
A battery tender is compensation for an underlying problem. If you need a battery tender for only 2 weeks of sitting, you DEFINITELY have a problem.
I don’t like “could be” in-person diagnostics. You’ll get a new battery and two weeks later not be able to start the car. I’ve seen it time and time again.
Sent from my iPhone using Bimmerfest