The C1, while slower, was a little more energy efficient. Signal Reception seems to be ok too. I am expecting the C1X to be even better.
Combined with A19 Pro, C1X, N1. I would expect Air to be more efficient than 16 Pro. So with that in mind,
The Air ~3100 mah, the 16 Pro ~3600 mach should have similar battery life, or may be just slightly less than 16 Pro,
If that is the case I say Air is actually not bad. And we can look forward into the future for even more energy efficiency OLED, SoC and never Battery Tech. That would make Air perfect.
I am really looking forward to al the iPhone review this year. It has been a long long time since the iPhone produce range was exciting.