What your device runs out of juice mid update? It probably won’t, iOS 5 will remind you that your device must be at at least 50% battery or connected to a power source before beginning the update process.

This update requires at least 50% battery or to be connected to a power source.

That’s not to say that you can’t download the update with less than 50% battery and then unplug your device from the power source after starting the update process.

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