I have a 37 year old car. The (classic looking) Bluetooth radio is by far the most complicated electronics on board.
When I switch off the car, for safety, anti-theft and leaking, the battery is disconnected entirely with a key.
The radio looses everything: paired devices, position of radio tuner, volume, BT/aux/radio mode etc. Whenever you start the car, you'll need to mash at least five buttons and knobs to either find a radio station or reconnect Bluetooth. Modern tech is often so smart it becomes dumb again.
As I pointed out, some pieces and parts keep using electricity. Amongst which is the radio. This will drain the battery. Slowly, but surely. If I don't use the car in 14 days, it (probably) won't start; but with this wiring it does, just fine.
Which is why I installed a [don't know the english word]¹, so that my battery is switched off entirely. Everything in the car is fine with that. Except for this "modern radio".
Hiding that switch in a somewhat unexpected place also delays theft. 37 y/o cars are easy to steal; this makes it slightly less so.
When I switch off the car, for safety, anti-theft and leaking, the battery is disconnected entirely with a key.
The radio looses everything: paired devices, position of radio tuner, volume, BT/aux/radio mode etc. Whenever you start the car, you'll need to mash at least five buttons and knobs to either find a radio station or reconnect Bluetooth. Modern tech is often so smart it becomes dumb again.