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Originally Posted by HarryT
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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That's something, at least! I can definitely say my battery life has decreased since the update. I did a little test myself, actually. I did a full charge, including the pull-AC-cord-out-put-AC-cord-back-in-while-Reader-on test. I had a full charge at that point. That was last Tuesday evening (May 1st). This morning (May 7) I have 3 out of 4 bars full. So in about 6 days, a bar drops. I also have a 2GB SD card in there. I never had such a drop before the update.