The secret is that not all Li-ion batteries are equal. There’s a reason your iPhone battery starts to die after a few years, they want you to replace it. Car Li-ion batteries are made differently and have a much better C/D profile. I don’t have exact numbers but I’ve read about this a couple of times.
...and after referencing ChatGPT :)
“A typical phone battery can last for around 300-500 cycles before its capacity starts to degrade.”
“Tesla’s batteries are rated for around 1000-1500 cycles before degradation of capacity, but this can vary depending on usage and charging patterns.”
And those are full cycles.