How many hours of battery life?

In my experience, GPS activities have been on spec in the two months I’ve used the watch.  For All satellites, it burns about 3% per hour using a standard garmin HRM chest strap. 

Thanks for the reply, as soon as I complete the event I will post up how it did.

If you spend, like two minutes on the forum, you'll se a large number of reports of people having no problems with battery life, which should mean that the stated no of hours on the garmin website is pretty accurate...

Having said that (and this is copied from another question about the same) then my battery life looks like this:

I am on 12.23 - Using an Iphone, Beats headset and Stryd,

- Using one of the standard watchfaces 
- Multiband off
- Gesture on
- 10 pct light on gesture.

Started a week with 100 pct.

Monday - 4.5 hour walk (Walking mode with gps)
Thuesday - 5 hour walk (Walking mode with gps)
Wednesday - 5 hour walk (walking mode with gps)
Thursday - 2 hour running (Running mode) - using stryd pod + gps mode
Friday - 3,5 hour walk (Walking mode with gps.)

= A total of 18 hours of training and still with 46 pct remaining (and the same time using the watch as - just a watch).

Saturday morning +46 pct remaining on battery

So I would say you should be without any problems be able to be active for 16 hours. Any particulary reason for using the HRM Pro pulse belt?

If you during your activity needs to carry your mobile phone, then you could remove the connection to the watch and only use the connection to the Connect App on your mobile. Here is how to do that:

https://www8.garmin.com/manuals/webhelp/GUID-8918512F-8099-433F-86CC-3E8249295E07/EN-US/GUID-BA221E23-F925-42CF-955B-49FF84425B88.html

Last weekend I ran a 51 miler and let the 955S run nonstop from start to finish.  I used the Rest timer (lap button) during aid stations to keep GPS and total time active.

I started at 6 am with just under 100% and finished at 5pm (11 hours) with 49% battery remaining.   I was a little disappointed in that mine is solar unit and I was out in the open for much of the run.  And my buddy who ran the same distance/time with me had 63% remaining on his straight from the box FR255.

Ultra Run Settings:

• Fw v12.23 (bad move)
• SatIQ - On (auto select GPS)
• HR - On
• Stryd foot pod
• Alerts - On (1 every 40 min / 1 every hour)
• VO2 Max - On
• Default for remaining items

As far as I understood it - 3 hours outside in 50,000 lux conditions should give you around 1  pct. battery while in "active mode".  

So as a lot of people are saying, the Solar version is really not worth that extra bucks.

In my usage, I've yet to find a good way to see how much juice it puts back into the watch.  There is a widget/at glance that shows peaks and valleys of solar intensity, but no real way to quantify a recharge score.  It would be nice to see small pie or battery gauge graphic that shows building blocks of energy captured. 

For my use case, the solar has NOT been worth the extra $99. 

I fully agree.

Agree.

10 seconds on a powerbank charge more than a whole day in full daylight.

But it's kinda cool to say that it's solar powered. 

Hi, I made recently the UTMB in Chamonix ,which took 31h46 in my case ... I started with 98%batery and ended with 28% ... using the UltraRun without track loaded .... I just loaded the track in last 20kms ...

I'm didn't use hrm strap during this activity as well.