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Is there a way to prevent an iPod Touch/iPhone from charging while my computer is running off battery power?

OS: Crunchbang Linux (Based on Debian 6)

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up vote -1 down vote accepted

Short answer is no.

Your motherboard and hardware would have to be able to support such a feature. AFAIK, no motherboard supports such a feature and it is possible the USB specification prevent manufacturers from implementing such a feature.

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The OS can detect when a system is running on battery power. The OS can disable certain USB ports. There's no reason the OS couldn't tie these two together. – Flimzy May 2 '13 at 2:33

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