I use the 2GB SanDisk SD card and have never had a problem with battery drain. I just got back from a five day trip. I threw the USB adapter in the briefcase in case I needed a refresh charge along the way from the laptop. (Let's keep the number of transformers down when traveling.) Anyway, I finished two books (~16 hours total) and I still had 2 bars showing. I did not have any music loaded.
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