> I think the iphone does a lot more in the background than you might consider initially.

I understand that. My point being that 25 year old tech, before the real miniatyrization of circuits and power efficiency mind you, has 7x charge time and yet we are impressed by a few additional hours.

> Here is an experiment to try. Use your phone as you currently do, but turn on airplane mode when you aren't otherwise using the phone. Leave it on overnight too.

Sure but to what benefit?

I already addressed the tweaks i did do in a sibling comment. Putting the phone in airplane mode is no different than having a dead battery in terms of usability.