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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]] gives 50 has a stated battery life of 13 hours, but without Bluetooth I found it lasted for nearly 24 hours in ! The extended modeincreases the rated life to 50 hour, but I've not tested that. 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.
