Will the hybrid battery charge the 12V battery when car is turned off?

The interest in 48V mild hybrids is cause that is the max voltage you can have before requiring isolating the battery on shut down.

So would replacing the traction pack. Like the traction pack, the 12V section shouldn't need replacing until well into the car's life.

 

My Prius 5 was parked at Brussels airport for 8 days last week. "Ready" immediately appeared when I pressed the start button.
The car is also only 6 months old, with 8200 km.

 

Mine was parked in the garage for 7 days recently. When I returned, the battery measured 12.2V and started with no problem. I keep it on a smart trickle charger that maintains a min. of 12.5V, max. 12.8V. The car is a year and a half old.