A better use of flexible screens than folding devices. Fitting under the cuffs of men's shirts is a constraint. I dictate most text entered on my phone, so a squishy typing surface wouldn't be so bad. Camera position could be tricky.
Problem is different people want different things. I for one want at least all day battery while using only about 60% of the capacity so realistically two full days battery from a single charge. I then want to be able to set a max charge limit of 80% beyond which the phone won't charge and have the phone die at 20%. Ideally, I also want the phone to be able to work off the wall meaning if the phone is plugged in to the wall, it should use power from the wall and not constantly charge and discharge the battery.
Serious question, when was the last time you degraded the battery of a phone enough to warrant replacement?
I got a Xperia XZ2 compact in 2018, and used it daily util a month ago. It made it through a day of regular use until the very end, when I had to retire it because of issues with software updates.
Modern-ish Li-Ion batteries can take thousands of full cycles.
I have some seriously bad luck with spicy pillows. I had a nexus 4 and 5 that had their battery swollen. Also an iPhone 6 and a Poco X3 pro. Also, a ZTE z959 and moto E4. I don't want a spicy pillow. I'd rather the phone turn itself off before the battery swells up but ideally it should automatically disconnect the battery and keep running off of the wall unless it is too hot, in which case, it should shut itself off.
