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I don't think it's anything to do with the battery. Diablo's figures clearly show that the battery is draining because the Reader's operating system is drawing pretty much the same power whether the Reader is "on" or "off".
It's possible that the firmware update messed up some piece of code which should put the CPU into a low-power "standby" state when you turn the Reader off. If that is so, a future update should fix it. I note that one the "questions" on Sony's support web site is that "my battery life has decreased since the firmware upgrade" and the answer is "we're looking into it".
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