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Well, I can tell you this: it does not do this when plugged into the wall socket, even when fully charged.
Furthermore, when *not* fully charged, I can tell that even in sleep mode, plugged in via USB, the light stays on and it keeps charging. And when it finishes charging, it puts on a green light, even in sleep mode.
What you *might* have a case is, if it's fully charged, and it's plugged in via USB, and then it goes to sleep, it will turn the light off and no longer charge. But I can't confirm this at this time. I have no idea why it might behave this way.
I would not worry about this at all unless you plan routinely leave your Kindle 2 plugged in, while fully charged, to the USB for long periods of time. If so, then this bears further investigation.
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