although lithiumion batteries like the one used in the reader doesn't have the memory effect, one must keep in mind that there is a finite times that the battery can be recharged. I think it was about 200 before it's capacity drops. So if possible... don't recharge it that much (also one of the reason why I use SD-cards. It's faster to use my computer's card reader than connect the Sony Reader)
but said that... i can't stand it when there;s less than 2 bars...
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