The only trouble I have with my own car is having to replace the 12V battery pretty often but it's because of the lack of car usage as I work from home and hardly been going anywhere the last couple of years due to the pandemic. And when I do it's a very short journey. But it's only 100-130 bucks to replace the battery.
There is a device out there that will disconnect the battery if the voltage drops close to low enough to start damaging the battery. I was looking into it as I had a Jag that would kill the battery if it was left to sit for about three weeks.
Alternatively, I have a device that I built that will report the battery voltage over wifi. You could set things up so you would get alerts if the battery voltage dropped too low. I've only done preliminary testing so far but haven't tested in in action as I no longer have the Jag and the VW will go for many months without draining the battery.
Thanks for the tip. I had a look and can see some bluetooth options. I do have a decent topdon battery tester which tells me what I need to know I guess. It's only really a problem in winter.
But there definitely seems to be some extra phantom drain on the car I have now. Didn't have this problem with my previous Fords or Mazdas which would also sit unused for a week quite often and never replaced the batteries except on a MX5 which is understandable I guess.