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Battery discharging occurs when the eReader needs more power. It may be that the book somehow activates the WLAN (maybe it's not true, but if it is it may be a feature eg when an ePub has a live link to outside world like amazon.com). It may be that it contains a recurrent formatting error and the CPU spends energy in solving the formatting (more likely, there are cases when wrongly formatted books blocked the Sonies). Humidity inside can probably also not be that easily dismissed.
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