Originally Posted by
geo8rge
Dynamos are useful if you ride where there are no stores to replace batteries. If there are any stores open where/when you ride I suggest a battery system or even a flashlight (3W led maglite). Something that mounts to your helmet would be nice too.
I went with a dynamo because
1) it's always there, always charged
2) it works when it's cold (NiCd & other fancy batteries have poor performance below freezing temps)
3) No landfill, recycling, or worrying about chargers or the number of charges left.