Er, what? If I'm reading it right, all the components you need for a smartphone are in sections 1 (brain) and 2 (spine) -- the processors, the radios, the screen, _everything_. Section 3 (heart) contains the battery, plus "secondary electronics". I would assume this means that section three is a sort of combination battery plus TOH, allowing users to design their own hardware and plug it into section 3. As such, I don't see why you couldn't have a section 3 that is all battery and nothing else (since you really don't need any electronics in section 3). Or, why couldn't you design a _modular_ section three, composed of a replaceable battery inside of a housing that fits into that slot? And again, why couldn't you purchase a modular section 1, where separate components could be replaced separately? (I would imagine such a section one would be a lot more expensive than an all-in-one package, but I don't see why it couldn't be made...) Anyway, I believe the value behind the puzzlephone is not "here, you've now got three parts that you can join or remove yourself", but rather "here, you've now got three parts that, if you want, any one of which could be individually replaced with something completely different without throwing away the other two". It's the customization, not the efficiency, that should be the selling point here. But yeah, until they have more than just the default "brain", "spine", and "heart" available, that value probably won't be obvious...