2011-07-16/17 Sat/Sun - Dunwich Dynamo DD19

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..
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Give thanks for the above advice Rod Munch...