That is an important point - since the K4 and the K5 have different behavior when "inactive" (different low power states).
In fact, you should probably give us not only the Model, but the firmware version being used and the first four characters of your serial number.
Whatever model/firmware/device it is, twobob is probably correct about the battery drain - you most likely have Wifi and/or 3G enabled at that time. USB networking does not "eat the battery" but the wireless devices certainly do (even Amazon says so).
Last edited by knc1; 04-06-2013 at 08:34 AM.
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