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A v1 iLiad usually has around 12 hours.
A v2 or Book Edition usually has around 15 hours.
Currently, the DR only has about 5 hours. However, there are a couple reasons for this (mostly because it's a new device and they're still working on the software). First is that there is a bug they are fixing soon that will increase it to 8 hours. Second, is that they have not implemented any power management features on the DR yet. Why they released the device before these features were done is anybody's guess. However, they plan on a future firmware upgrade that will implement standby and sleep modes. With those, the DR should have longer battery life than the iLiad.
Going into standby in between page turns should theoretically give the DR up to 24 hours. With sleep mode, it could theoretically run for "weeks" (but sleep mode basically means that it's sitting idle and you're not using it). Real world results for those two modes have yet to be seen though. We won't know for sure what the typical battery life will be with them until they're released.
If battery life right now is important, then the iLiad wins. If you're thinking more long term, then the DR will likely have better battery life (depending on exactly how well the power management features work).
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