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I think there’s a max size battery you can put in laptops before you’re not allowed to bring your laptop on a plane. It’s either 80Wh or 100Wh.

So manufacturers can only stuff so much battery into that space.

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100Wh.

This is also what the 16-inch MacBook Pro has, so even if they find some empty space inside it after Apple Siliconing it, there's really no going up battery-wise anymore.

In practice, external batteries are so cheap these days and easier than ever to charge your laptop from with usb-c, it's less of an issue than it used to be. It certainly holds up with phones and smaller devices, though.

I'd think the best argument for a thicker MBP would be greater cooling potential anyway.

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