Join Date: Sep 2006
Location: North Seattle, WA
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I had a Blackburn Mars 3.0 (I think it was a 3.0) and it seemed to go a month or so between battery changes, using alkalines. I was riding about an hour a day. I also have a PBSF, and despite being on the same amount of time, the SF has gone through one set of batteries and is still going strong, while the Blackburn has been through many sets. I ended up taking the Blackburn off as a waste of weight and batteries, and put it on my girlfriend's bike, so she's got a decent marker as she re-learns to ride.
I should also note that within a week of switching it on, one of the LEDs died, so it's not putting out as much light as it should (and that may be contributing to bad battery life, now that I think about it). Based on my experience, I wouldn't go with another Blackburn blinkie, and would think twice before getting anything Blackburn.
The Planet Bike Super Flash, on the other hand, absolutely rocks. Since I noticed the bad battery life on the Blackburn, I've been using the SF almost exclusively. It's bright as hell, and gingerly sips at the batteries. Planet Bike really hit the mark with that blinkie, although I'd be happy if the mounting bracket were a bit more sturdy.