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Ultramarathon and battery life

Former Member over 6 years ago

Hi all,

After almost 6 months of wearing it, I am quite happy with the 645M (despite the initial hiccups) and haven't had many problems with the watch so far.

In about 2 months, I will be doing a 50milers trail marathon, which should take me around 16/17 hours. I plan to put the watch on the lowest battery settings (gps only, no bluetooth, smart tracking, etc...)

Has anyone attempted to stretch the battery life this long?

Thanks!

0 ares952 over 6 years ago

For those who are interested in an update,

Went into the race this past weekend, not really knowing what to expect from the watch...so, just changed all the settings to a minimum.

GPS: Ultratac
Recording: Smart
No Bluetooth
No Music
Facewatch - only one - the 1Race
No other devices connected to the watch

50km and 10hours laters - watch still had 46% on it!

Ultratac is not that bad as I was out in the open mountains of HK, but not accurate enough to tell me the next checkpoint.

Hope it helps!

Thanks a lot for your experience.
Just for the curiosity. What distance did your watch measure and what the real distance should have been?

With my experience, I estimated ultratrac to track for 19 hours, what matches your measurement (I have measured on 4,5 hour hike, but with BT on).
With differnt measurement 2 weeks ago with ANT+ HRM RUN2 and running, I estimated it for approx. 17 hours with BT off, but with almost 8% error.

0 Former Member over 6 years ago

Hi ares.

The watch measured 55.2km - with the extra steps and going around people, could explain it, so it's not too far off!