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I had a problem with a drained battery in a Kindle Keyboard. I discovered that I had left the 3G on, and that, as soon as the battery got enough charge, the 3G would drain it again. I was able to turn on the Kindle as soon as the charging light went green and turn of wireless. I never had the problem again. I suspect that older Kindles keep wireless active when in sleep mode (not if the device is actually turned off). Reports are that newer Kindles don't have this problem.
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