Understood. This seems reasonable and not a hard task. So, normally, it will last 2 months as in the advertisement? (of course with non-faulty nook). As you said, it is "expected 2-4%" per day. Is it really? I know that the e-ink technology uses power only when the screen refreshes itself, so when the nook is in stand-by, why does it drains off ?
I recently sold my K3 and it didn't have this issue. The battery lasted always more than a month.