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From Fellrnr.com, Running tips
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** The [[Garmin 920XT]] gives 40 hours in extended mode using UltraTrac and variable recording frequency.
** The [[Suunto Ambit2| Suunto Ambit2 R]] gives 20 hours in extended mode (60 second GPS sampling) and the more expensive Ambit2 gives 50 hours. There is some course display capability, but it's not as good others.
** The [[Polar V800]] has a stated battery life of 13 hours, but without Bluetooth I found it lasted for nearly 24 hours! The extended mode increases the rated life to 50 hour (I got just over 50 hours), and you can charge it on the run. The V800 has no map display.
** The [[Garmin Fenix 2]] will give 50 hours in extended mode, but it has mediocre [[GPS Accuracy]] even in normal mode and it has the occasional "lost satellite reception" problem.
* You can turn off GPS and use a [[Footpod]], which boost the battery life of most Garmin watches to several days. Obviously you lose navigation and while the accuracy of a [[Footpod]] can be better than GPS, the Footpod does not do so well if you're taking [[Walking Breaks]] or running on twisty single track.
