With light at a low to moderate level and WiFi (also 3G) off . . .
Then the big power user is turning a page.
So "pages per charge" is probably a better measure than "days per charge".
My experience with a PW-3 is about the same as Barty above.
A moderately long book on a single charge (over a period of 2 to 5 days).
A long book on one re-charge (over a period of 7 to 10 days).
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