Quote:
Originally Posted by DiapDealer
I'm not arguing which battery is better, because I frankly don't care-- and I don't trust either company's in-house "tests", the truth be told. But honestly... when was the last time that you didn't have access to an electric outlet for more than week (or had your e-reader's battery die at an inopportune time)? A week will suffice until forever can be be achieved. 
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On the practical side I'm totally with Diap; if the batterys last more than a month, i don't care if one can last 1 week more...
Now, regarding the OP and the rest:
Of course the idle state consumes battery; if it wasn't the case, you could full charge your Kindle and turn it on 1 year later with full charge (which wouldn't happen); there are many ways in which a powered device can loose power/energy.
Specially, a lot have to do with electronic components (magnetic fields and etc)