Joined: Jan 2009
Posts: 44,306
Likes: 6,564
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
[MENTION=519642]SafetyThird[/MENTION], let us know how it works out. If you read this whole thread, you will probably see that charging from a dynamo hub isn't economical or practical except if you are far from a power outlet for a long time. Those battery packs are light for the power they provide and are usually a complete solution.