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When the power is off it doesn't make any difference if the whispernet is on. Leaving the whispernet on will really drain your battery when the unit is on. I only turn mine on every few days for about 10 minutes.
Usually I leave my Kindle in sleep mode with me reading anywhere from 1 to 6 hours a day and the battery lasts about 5 days. I've been down with strep and done a great deal more reading and my battery lasted a little less. This makes sense as it is the actual page turns which drain the battery.
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