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I didn’t know you could start the car with a dead key battery.
but I’m sure I found how to start the car with a dead key battery on one of the threads in this forum
Yep :)

This is the thread:
 
Yep :)

This is the thread:
The short answer is to put it in the right-hand (for an RHD at least) front cup-holder and after a few seconds it will be picked up and you can start the car. There is a key symbol in the bottom.
 
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