Join Date: Sep 2010
Location: Near Boulder Colorado
Bikes: Old Mercier, Less old Vitus, old Stumpjumpers
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I have one of these. I use NiMH rechargables and get a lot more than 3 hours out of the thing. 12 at least.
Set the unit for the battery type you're using. It's under the setup menu somewhere. I don't think it changes the battery life, but it does change how the battery display computes its indication.
Make sure you're using the backlight only if you need it, and set it for a short "on" time.
I use the garmin bicycle mount. Had one of them break on a pothole bump. I had the wrist strap looped around the bars and that saved the unit from a crash.