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Interesting. So David's measurement shows that Kobo's labeling is accurate, and it will attempt to draw up to 800ma max if the charger supports it.
I guess it must attempt 800ma, and if the voltage supplied by the charger drops or cuts off, step back down to 500ma.
I know that on many computers even attempting to draw more than 500ma will trigger a shutdown of the USB port with a warning message. That doesn't happen with the Kobo, so it must recognize when it is connected to a computer USB port and limit the current to 500ma in that case.
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