It's been six days now since the full charge, with no SD card, and I just finished a novel, and there's still 4 bars on the battery indicator. I just had to connect to my PC via USB for about a minute to transfer more books for reading, but that shouldn't have added much charge to the battery. I'm set now to read for several weeks, if the battery lasts that long. After the battery drops to 2 bars, I'll charge it again and put the SD card back in to make sure the battery-life drops back down to 4-5 days. Then I'll try it with the SD card I got from Astak with the unit, and see if it differs. I'll post another update when the battery reaches 2 bars.
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