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I have a prs505.
I just got 6 days and 3 days out of 2 charges. I decided something was wrong and came across this thread. I was getting much better battery life when I first got it. So the only change was memory cards. I got a memory stick and sd card on black friday and stuck both of them in the prs-505. I dont have a need for this many books but I was purchasing for the future at $15 for 2g sd and $20 for 2g memory stick. Now I also have a camera that uses the memory stick. So it looks like the flash sucks the battery done big time because I removed the cards and charged 5 days ago and the meter still shows 4 bars. I dont read a lot of pages. Currently I am reading a pdf2lrf converted book that is 600 pages and I am at 100 pages right now. So when my battery finally runs down to 1 bar I will put the memory stick only, back in and see how long it lasts. I have not been opening the books on the flash. It does show the books in the book list. The books on the flash are pdf2lrf books. I read on another thread that the memory stick uses less power.
bob
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