It’s iPhone XS launch day, which implies we’re studying all of the little tidbits concerning the new iPhones that Apple or within the early critiques by no means detailed. For starters, the primary YouTube drop take a look at exhibits the iPhone XS is much more sturdy than the iPhone X. We additionally discovered that Apple might have needed to launch AirPower in time for the iPhone XS’s arrival, however that clearly didn’t work out. Now, due to the teardown all people was ready for, we’ve realized a peculiar little element concerning the iPhone XS that comes as a whole shock.

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Earlier this week, iPhone XS documentation that Apple filed with a Chinese regulator revealed that the iPhone XS encompasses a battery that’s barely smaller than final yr’s iPhone X. Even so, the iPhone XS ought to final for 30 minutes longer general than final yr’s mannequin. iFixit’s just-released teardown of the iPhone XS and XS Max and located the reason for the smaller battery. The iPhone XS has a single L-shaped battery, whereas the iPhone XS Max options two battery cells, similar to the iPhone X. Here’s a side-by-side comparability, with the iPhone XS positioned within the center between the iPhone X (left) and the iPhone XS Max (proper). But in case you look carefully on the iPhone XS, you’ll discover a peculiar hidden notch within the battery.

What you see above is an X-ray photograph of the three telephones, which reveals a wierd battery design for the iPhone XS. There’s the hidden notch I used to be speaking about. Apple even describes it as a notch in at the least one battery design patent. But why does the battery want that notch? iFixit explains:

The problem with any lithium-polymer battery cell is that every nook must be sealed to stop undue stress from thermal growth—and for the reason that battery of the XS has 6 sides vs. the normal four, these additional corners could be difficult. To scale back the stress on the corners, Apple notched the interior nook of the battery (as described on this 2016 patent). This dramatic shift opens up lots of design potentialities, however the massive notch is chargeable for the lower in capability relative to the X. Only time will inform how this new cell performs with age.

The teardown, accessible at this hyperlink, additionally notes that there’s no new proof of recent waterproofing, suggesting Apple might have undersold the iPhone X’s water ingress safety. Also, Apple has designed a model new chip, the Apple 338S00456 discovered contained in the Max mannequin, which is an influence administration…

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