The touchscreen itself doesn't drain the battery much, if any, it's the functions that the touchscreen provide that may drain the battery quicker.
Using the annotations, search, zoom functions etc. will drain the battery much faster. If the books are not pre-paginated by the eBook library, I would assume that the initial pagination would have some drain on the battery also.
It is the built-in light that quickly drains the battery on my PRS-700, but that need not worry you.
Wetdogeared (WDE)
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