I'm in the market for a new headlight soon. I've been commuting for the past year or so with some cateye and Blackburn blinkies which are pretty inadequate on my commute. I'm leaning towards a flashlight and can't seem to find too much information on battery types. I'd kind of like to get a AA or AAA powered light for the ease of getting emergency replacements, is there a major power/ runtime difference? My commute runs from suburban to a more country-suburban area with no stores to stop at after the first mile or two. Takes me anywhere from 30 minutes to an hour or so for a total of about 7 miles. I could also go with a magicshine system, but I have nowhere to mount the battery, as my bike only has Brazeons for my one water bottle cage.
I'd like to avoid going through DealsExtreme, just due to the wait time on their site. If I could buy locally, that'd be great too. Any recommendations? Should I go with CR123A batteries or would AA/AAA be fine?
Anyway, thanks! (I did a quick search, didn't seem to find anything particularly relating to battery type and power/runtime.)