It's official: Smartphones will need to have replaceable batteries by 2027
androidauthority.com
Do you miss phones with replaceable batteries? By 2027, you won't anymore because, by law, almost every smartphone will have them again.
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Thickness is the only concern I have. I’d love to be able to replace the battery in my iPhone safely and easily, but I don’t really want to give up having a phone that’s less than 10mm thick.
Galaxy s5 was only 0.3mm thicker than an iPhone 14.
Ip67 and replaceable battery
And it had completely different innards and battery capacities. Just grabbing that old battery and putting it in a new phone would seriously limit the runtime on a single charge. Which is kinda the point, I really hope we don't trade replaceable batteries for the need to recharge twice a day or switch batteries to even make it the whole day. Or have a noticeable bulkier phone that won't fit as comfortably in my pocket. Or that it may not survive the rain shower I got surprised by because they skimped on the water proofing.
The main factor to consider in making an ultrathin phone in 2023 has nothing to do with the battery. It's the requirement for a certain level of build quality to be suitable for end consumers. At some point we just need to develop new materials, because we can't make it any more ultrathin without it also becoming ultrafragile using the materials available.
It hasn't really been a focus since we realised back around the iPhone 5 that making these sweeping compromises for thinness was yielding diminishing returns and causing other problems. Today that's still the thinnest mainline iPhone, only the SE and 12 Mini are thinner. 13 mini is thicker, and there is no 14 mini.
Ergonomics matter too. At this point going thinner is purely a marketing exercise rather than a practical improvement of any kind. If they were able to businesses would be making them so thin you can't hold them without risking a paper-cut so long as that allowed them to convince people that meant it was better than their current, designed for human hands, smartphone. Same thing with size. Personally I prefer a larger display and am willing to accept slightly worse ergonomics for it but even with more or less average sized hands I definitely find phones with 6 inch or under screens much more comfortable in the hand than the more typical sizes today and I know plenty of people with smaller than average hands (ie, half of the population) who really hate holding modern gigantic phones (and so often have held off on upgrading to a new model until I've steered them to something the same size as their old one.)
The size thing is just another excuse.
There were/are phones with replacable batteries that are thinner than most current phones. Some were 7.5mm and even less.
Thickness of your phone is now dictated by cameras. Because of focal lengths and what not, they need to be a certain size, that's why they're always with an overhang.