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					Originally Posted by NullNix  Letting both drop until they insist on a recharge and shut down seems like a good idea, though honestly this is just a guess and i have no actual idea if this does anything at all... | 
	
 Not directly applicable perhaps, but I recently replaced battery in my MacBook Pro. Instructions to calibrate were exactly what you suggest, and they said it was good to do it every once in awhile. 
Though I cannot think of when I’ve intentionally allowed one of my Kindles drain to zero (leave them sit around long enough and they do it without any intention).