To keep it nice and frisky, put it to sleep instead. This will happen automatically after about 10 minutes or so of inactivity, but you can do it manually by briefly sliding the switch and releasing it.
Because of the e-ink technology, the battery isn't in use unless you are turning pages, so the sleep mode seems to be the best choice unless you know you won't be using your Kindle for an extended period of time, like a week or so.
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