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Mine appears to be rated at 1amp, as my kill-a-watt meter was reading 5.6w of output, which comports pretty well to a 1amp charge power. That is about 89% conversion efficiency at 1amp. That is on the high end, but within reason for efficiency. If it is actually .85A, then the efficiency is pretty darned low (76%). I can't see any text anywhere on my charger other than NOOK written on it.
Most of my other USB chargers are in the 85-90% efficiency range.
Since it'll charge off of a computer USB port, really any amperage USB wall adapter will work. Unless there is something badly flawed with the battery, using a higher amperage wall charger won't result in any issues. It'll only draw as much amperage as the charge circuits will allow (so long as it is still a 5v charger).
Out of curiousity though, I am going to try my 1amp, 1.2amp and 2.1 amp USB wall chargers to see just how much it actually draws from each.
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