Optimizing MK2s battery for long hike/runs

I am using MK2s mostly for diving and short runs 1-2 hours. Lately I have gotten into longer runs. Battery was 65% and I could just finish my navigation, I followed a set course on Strava. The battery lasted 3:20h and died like 5 mins after the run. What is the best setting for long runs? Would it be even possible to run an Ultramarathon with the MK2s?

Obviously fully charging. But I doubt I would have gotten more than 5-6 hours out of the full battery. Messenger, smart functions and oximeter was already disabled.

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Garmin - Chris over 1 year ago +2 verified

With only owning your watch for almost 2 years, it is odd that your battery died as quickly as it did. You should be able to consistently get about 14-15 hours of GPS. (Up to 18 hours in a perfect of all…

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+1 Garmin - Chris over 1 year ago

With only owning your watch for almost 2 years, it is odd that your battery died as quickly as it did. You should be able to consistently get about 14-15 hours of GPS. (Up to 18 hours in a perfect of all perfect scenarios.)

If you had your PulseOX set for "All Day" in your Sensors & Accessories > Pulse Oximeter menu or if you listened to music at any point while recording the activity, either feature might explain a faster than average normal battery drain. Using your wrist gesture while running and having a high brightness level or frequent smart notifications triggering your backlight, could also have an impact.

Your specific smallest size of watch might not the be best model for running an Ultra but it would depend on the length of using GPS. Battery size is critical for an Ultra which is why both our Enduro/Enduro 2 are designed for ultra marathons and both watch series are the largest 51mm size.

- Why is My Descent Mk2 Series Watch Battery Draining Quickly?

0 3245931 over 1 year ago in reply to Garmin - Chris

Maybe the mode "Navigate" uses more battery than trail running? That's my only explanation.

0 Garmin - Chris over 1 year ago in reply to 3245931

If using Navigate strictly on the Map screen, maybe a little bit of a dent for difference but only my speculation.