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After having my PRS-505 for about 6 months, my PRS-505 battery is lasting almost a month between recharges. I'm generally charging it about every 3 weeks or so with moderate usage. I only charge it up once it gets down to a single bar of battery left. Usually, what happens is that I sit down to read and finally notice that it's down to 1 bar and then forget for a few more days to actually go hook it up to the laptop to charge it.
The key, I think is that I'm using a MemoryStick Duo add-on card instead of an SD card. (Sony Memory Stick PRO Duo 1GB) As much as I wanted to use an SD card instead, I'm pretty happy with the Sony card.
If I do a lot of reading, I have to charge it up more frequently (every 2-3 weeks). But it's a lot better then my cell-phone which goes dead if I forget to look at it for 2-3 days.
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