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How long will a 945 last running 35km a day?

9386496
over 4 years ago

I run for 2 hours 15-20 minutes a day and I'm having to keep charging the watch it doesn't last more than 3-5 days or so how long should it last? I get 1.1% hour 

  • 0 over 4 years ago

    maybe ask in the 945 forum

  • 0 over 4 years ago

    That means you have up to 13 hours of GPS usage AND up to 5 days smart watch usage on top before before charging.

    As the 945 is advertised with about 36 hours of GPS tracking or 14 days of smartwatch mode in the best case and is known to have a little shorter battery life in real-life, the math does check out.

  • 0 over 4 years ago in reply to Markw50
    Markw50 said:
    ask in the 945 forum

    Moved thread.

  • 0 over 4 years ago

    The big power drains are

    * Music
    * Backlight
    * PulseOx
    * Using GLONASS/Gallileo in addition to GPS
    * Custom watch faces, rather than the stock Garmin ones.

    If you are not getting the battery life you expect, I would look at the settings in those areas.

    Equating 3-5 days with 1.1% per hour is a bit meaningless, as there is a big difference in battery consumption when tracking an activity with GPS, and when the watch is in 24/7 mode.

  • 0 over 4 years ago

    depending on your actual settings (watchface, smart, GPS, sensors etc.) I would expect at most 5 days: 

    atctivities: 5 x 2,5h x 4%/h = 50% 

    watch: 5 x 21.5h x 0,4%/h = 43% 

    total: 93% 

  • 0 over 4 years ago

    Well, specs say:

    2 weeks in watch mode which means 0.3%/hr

    36 hrs GPS mode giving us 3%/hr (rounding it up consumption wise)

    2.5hr/day running = 7.5%

    21.5 hr/day watch = 6,5%

    Total per day: 14% = 7 days absolute max

    Which are optimal best cases which no user is ever going to get.

    You might start using backlight, vibration, bluetooth, GPS+GLONAS (or the other one), OHR, pulseox, temperature has an effect, etc and down it goes...

    So yeah, I'd say about 5 days seems like a reasonable actual max...

  • 0 over 4 years ago

    I notice one of the bigger power sucks on mine that I have noticed is the setting of 'Backlight' / 'During Acitivity' / Gesture / Time off delay  (and Brightness)

    Usually time off delay (or whatever it says) is 8sec to 30sec maybe for me... but when I do a lot of indoor training in my dark basement to see my bike trainer workout wattage targets I will set it to 'never' .... so essentially backlight is on permanent.  End up going through better much much quicker during the week.  until I remember that I changed the setting and I put it back to 15sec.

    I have since lowerd the backlight brightness, even 20-30% is plenty for me.