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I ran my phone all day on my last trip with my logging app running, from 9AM to 10PM most days without a charge, and usually wound up right near the low battery warning by the time I was done. All very dependent on the phone, though, my last phone couldn't handle regular use for that amount of time without dying. Of course, this was all screen off in my pocket, too, leaving the screen running will kill it in 2-3 hours.

That said, if all I cared about was distance, I still far prefer the computer on the bars. Just much easier to use.