Even only with one watch (Amazfit Balance 2) I have dropouts and HR freezing. I will do a test only with the Suunto Race 4 paired and see whats happening, so I can see is this a problem only with the Balance 2.

@martintrail Thanks for the clarification. I’m not that at home with the workings of R-R, obviously.

I just ran the race and didn’t have any problems at all with the new heart rate belt or the sensor. It seems that resetting the sensor helped. I’m also going to test my old heart rate belt with the sensor just to see if it might have something to do with the old belt. [image: 1790056282643-4cd90b0b-9bf9-4f08-8c93-973125f751dc-image.jpeg] greez

@CroShark Report your problem to suunto support@suunto.com Have to say, I have reported it multiple times (my race s looses it’s connection to my polar oh1+ and stryd quite regularly), but I don’t think suunto is actually working to fix the problem. They told me not to expect a firmware with a fix anytime soon (and I think anytime, for my race s) Do have to say, regularly reboots (as in every week) does mitigate the problem.

Another interesting feedback from this reviewer, in which he noted some strange behaviour from the HRM2 (the sensor was stuck at 150 bpm). Here is where he discusses it. FWIW it worked without a hitch for me today… but that’s just a one shot. I’ll keep an eye on the matter.

@vinc14 I’ve got the same problem: my son jumped into the swimming pool, but in my case the HR was actually closed properly, although there was water in the battery compartment as well. So I think the problem might not be that it didn’t close properly, but rather a fault with the HR IP’s seal. I’d send it back to Suunto, but the problem is that I can’t find my invoice any more.

@Mauerwegler Hey guys, late response, but could help others as the app and docs aren’t intuitive. To pair the sensor, go to the app settings, then go to Activity & training, and click Pair HR sensor. Hope it helps. I don’t know why it’s not located with the pair device button on the home screen. I also searched for quite some time…

@Elipsus no worries, I just shared the “why” : )

@halajos Looks very much like clone, or exactly the same product under different branding, of Morpheus M7 HR belt. Morpheus works great for ZoneSense, plus I haven’t experienced any drops or disconnections like many people report here with their Suunto belt or Polar H10. Around $40, looks like a solid choice compared to M7 at ~$100.

@2b2bff Interesting, that’s good to know and I might give the Coros HRM a try whenever the Polar decides to pack up. With it on my upper forearm it doesn’t bother me at all, if I’m wearing long sleeves it just sits underneath whatever I’m wearing

@Blaz-Kelbl Hi. All the watches I have used (Suunto, Garmin, Polar) cannot measure heart rate from the wrist properly. Sometimes they succeed very well and sometimes very bad. Heart rate belt is the only way if you need/want exact reading. Best Regards Pasi

@cosme.costa Having Suunto OHR armband would be cool. Sorry being offtopic

@PIPA44800 exactly, this is not a support but a Community forum.

ah okay, thanks for the replies. That is unfortunate. It happened twice already that I didn’t manually switch to the other device (i switch between the two every day so they can properly dry before I use them again) and I only got pulse based heart rate without zonesense for the activity.

After days of using Race 2 HRV i decided to give a try to Suunto Chest Strap again. Yesterday on shopping i bought new CR2025 batteries different brand (Energizer) I put new battery to strap. Wet electrodes of strap. Connected strap with Race 2 succesfully + get strap on my chest. 100% Chest strap battery. I DIDNT start exercise. I just took off chest strap + I took off sensor from belt, everything was laying separate. Next day I started exercise with strap - it was magically 20% batttery left before I started to run. Lost 80% during 24h without using it and having sensor taken off from belt with dry strap so its impossible it could work anyway + battery should last 500h. Next day I started running exercise with 20% battery in sensor, ended up and magically Race2 shows it got 30% battery left Did 40 minutes gym session - still 30% battery. Now i know its not batteries fault. Its sensor from strap/Race2 software that reads wrong battery status or problems with connecting BT. or watch itself. Its my probably last try and post, just wanted to give a info

@Mattg576 Glad to hear it is working now.

@TED77 The above are all true and useful. One other thing to keep in mind is there is no ANT+ which is useful if you are using a bike computer. Also you can only have one BT connection at a time vs the HRM Pro will allow 2 simultaneous connections.