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Almost all devices quote similar numbers for "page turns per battery charge", but what distinguishes good battery management is how long they last switched on but without turning pages. The longest is the Hanlin V3, then the Sony PRS-505 (both more than two weeks). The Amazon quotes "weeks" for the Kindle 2 with Whispernet turned off. Netronix hardware tends to do less well, and I think the Cybook Gen3 actually turns itself off after a while to conserve the battery.
I don't know if it has been tested, but if a device is actually turned off then the battery consumption should be very low. If the battery is user replaceable, e.g. on a Kindle 1 or a Hanlin, I would take the battery out completely if I was storing the device for a month or two.
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