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If I get the HRM will it impact the battery life of Forerunner?

Former Member over 5 years ago

Will the HRM-Run Strap help with BAttery life?

Top Replies

tess over 5 years ago in reply to jmto +2

jmto said:
This make me think, should I remove the wallet then.

It's my understanding the sensor light stays on only if you enter your Garmin Pay pin code. This is a safety precaution, so if the watch…
mcalista over 5 years ago +1

Yes, power consumption of the ANT+ connection is less than running the OHR.

But given the battery life of the 945 is pretty massive anyway, I wouldn't have thought this was a necessity or significant advantage…
Otto-Destruct over 5 years ago in reply to mcalista +1 suggested

mcalista said:
power consumption of the ANT+ connection is less than running the OHR

Confirming this: on the Fenix 6 line (soon to be 945), power-management modes let you test the effect of different settings…

All Replies

0 mcalista over 5 years ago

Yes, power consumption of the ANT+ connection is less than running the OHR.

But given the battery life of the 945 is pretty massive anyway, I wouldn't have thought this was a necessity or significant advantage.

0 Otto-Destruct over 5 years ago in reply to mcalista

mcalista said:
power consumption of the ANT+ connection is less than running the OHR

Confirming this: on the Fenix 6 line (soon to be 945), power-management modes let you test the effect of different settings.

Switching wrist-optical-HR (OHR) OFF and external sensors ON results in slightly better battery life. Full discussion on the F6 power modes: https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/fenix-6-series/212945/power-modes-vs-ultratrac-vs-expedition

Given chest-strap HRMs have >1-year of battery life on a CR2032 and are significantly more accurate than OHR, I tolerate wearing one for anything beyond a stroll in the park.

0 CloggyAbroad over 5 years ago

Keep in mind that if you use the Garmin Pay wallet your oHR sensor won't switch off even if you use an external HRM (it is used for on-wrist detection).

0 Levon over 5 years ago in reply to CloggyAbroad

Even during exercise mode?

I'll have to check next time .. minimally I'd assume the frequency would go way down ...

0 jmto over 5 years ago in reply to CloggyAbroad

Umm. This make me think, should I remove the wallet then. I don't really use it and if it has battery impact on activities why bother?

0 tess over 5 years ago in reply to jmto

jmto said:
This make me think, should I remove the wallet then.

It's my understanding the sensor light stays on only if you enter your Garmin Pay pin code. This is a safety precaution, so if the watch is removed, you must re-enter the pin to use Garmin Pay again. It shouldn't keep the sensor on if the pin isn't entered unless something has changed in a past update.

0 CloggyAbroad over 5 years ago in reply to Otto-Destruct

An HRM-RUN will cause higher battery use on a Garmin device than a normal HR strap without running dynamics. To calculate stride length (amongst other things) the watch has to transmit speed data to the HRM-RUN (or RD pod) on ANT+. This will use more battery than using ANT+ in receive mode only.

0 jmto over 5 years ago in reply to tess

tess said:
It's my understanding the sensor light stays on only if you enter your Garmin Pay pin code

Oh, good. So if I use it, then it's 24 hours on, or until I've taken it off or after that, it's not on that "am I worn in wrist?" -mode.

0 Bjorn over 5 years ago in reply to CloggyAbroad

yeah this matches my experience too, running with hrm-tri drains the battery more than running with wrist-HR (noticably, but not catastrophically, maybe 20% higher battery consumption).

0 Otto-Destruct over 5 years ago in reply to CloggyAbroad

What data-screens are people using when running with an HRM-Run?

A theory: it's not the data from the RD data that's causing higher power draw but having a dynamic data field like GCT or balance.

Try the it with nothing but time and distance up on the screen, see how it fares.