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					Originally Posted by HarryT  That’s correct, there’s no way to turn off a Kindle using standard firmware. Having said which, in aeroplane mode, a “sleeping” Kindle will retain its charge for a very long time (easily a month or two).
 Does it matter, though? Just keep a USB charger in the car. Many modern cars have a USB power socket, and those that don’t can do USB charging from the cigarette lighter socket.
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 Yep.  The question is how long does it take to go from dead to usable for an hour or so.  
I didn't know that the kindles wouldn't power down, still I should be able to remember to pull it out, charge it, sync any new books then put it back in the car.  It's just a case of getting into the habit of doing it at a given time each week.  I'm pretty sure it will last a week in stand by without too much battery drainage, especially if I leave it in airplane mode.