Why you can’t charge your Ipod* while downloading songs

Ever wondered why so few portable USB devices can be recharged from the USB port, even though it provides half an amp of relatively clean power at 5V?

Here’s why.

* Technically, now Ipods can be charged with USB power, avoiding the patent by using the docking cradle as sort of an electron-laundering middleman so that it’s no longer technically charging from “USB power”, but rather “dock power” from a dock which happens to be powered from USB…


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