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@Rod_Munch
My Hope ran on low power throughout the DD last year (I was planning to switch it up to full power later but never felt the need and forgot to do so). It lasted fine and even made it through the next week of late night commutes!
In fact, the Smart light and a Blackburn I also had didn't run out either and all of the spare batteries I had with me went unused. You certainly won't need anything more than you are planning to take IMHO...
On night rides I've had more issues with the light's themselves than the batteries recently (front lights flying off into the road and smashing - rear lights getting soaked by water spray, none of which has ever happened to me on a commute). As a result, I'll be carrying less spare batteries and more spare lights!