The Stellantis systems I’ve worked on have a nice feature that there is a battery for the proximity use, that you can keep the key in your pocket and press the button to run the car, as long as the key is within the four or five proximity sensors you are fine.
When that battery dies, you can press the directly to the start button and it uses a “receiver powered transmitter” RFID close proximity to start and run the vehicle.
Most people don’t know this, so when that battery dies they panic and suffer.
