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Something like the 830 has over 20hrs of life with GPS, so probably won't even need a re-up. I think its battery is 3100mAH.
Just plug it in from the start so you don't have to screw with it during the race. As a bonus, the screen backlight stays on when being powered by an external source, so you'll be able to see your screen if you're out there after dark.
"If you ain't first, you're last." Reese Bobby Talladega Nights