Sure all those things come at a cost to battery life due to some additional power draw, and because they use space that could be used for a larger battery, and we also get the bulging camera bump, etc., but Apple's not going to start removing features from the iPhone just to increase its battery size so it can be dual purpose, both as a phone and as a tethered battery and processing unit for AR glasses. Among other things, that would make using your iPhone pretty clumsy, and drain its battery even faster than currently, making the user wonder if they should be carrying two iPhones. In fact, the iPhone Air will have a few less features but its battery will be slimmer.Nah, the phone batteries have been evolving significantly in the last decade. The issue is that we simply took advantage of the extra energy to run more power-hungry hardware so we still end up with iPhone that last for a day with a single charge. Probably, Apple should change the focus and decide what is more important for the user. Maybe we don't need a display with 2622‑by‑1206-pixel resolution at 460 ppi or three-sensors big-ass camera module for cinema/DSLR-level photos and videos or an extra button just to take photos or so much RAM to run the gimmick AI features. Every hardware improvement comes at a cost.
If the rumor described in this article is true, Apple has just decided not to tether their glasses to a Mac or an iPhone for purposes of supplementing the glass's computing and battery power. This doesn't address whether Apple might still tether their glasses to an external battery pack, as is done with the AVP, but somehow that seems doubtful, but if they don't do that, it's hard to say how they'd get decent all-day runtime (if that's one of their goals) with just the batteries that can be placed inside the glasses, since all the glasses manufacturers have issues with that, and you can bet Apple will want to cram as much power-hungry circuitry and displays into their glasses as they can manage with the technology.
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