iPhone 5s continues to track your motion even when completely drained of battery

Surprising to me but a contrarian comment on reddit:

The M7 being a separate chip so this data can be managed without waking the CPU thus reducing battery consumption was described in the presentation which announced the 5S.It was not explicit that it would continue to work after your phone refused to operate, but given that even when an iPhone won’t power on it still displays the “out of battery” image when you try: it’s a perfectly reasonable expectation that low power features are still functioning.I’d bet it’s even in the developer docs.

via iPhone 5s continues to track your motion even when completely drained of battery : apple.

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