It’s the default. I think it uses less power then and the battery lasts longer. But most people want 2 channels anyway and CR2025/2032 are cheap.
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H10 has CR2025.
Disconnect the sensor from the strap when not using it, otherwise battery drains rapidly. This is probably because you can use the H10 stand-alone for short periods. It records internally and you transfer afterwards. My guess is that leaving it connected to the strap, triggers unwanted recording. It’s just a guess, but if you disconnect from the strap, the battery lasts 3-4 times as long.
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The only difference between the 25 and the 32 is the thickness. 2032 is 700 µm thicker.
Yes, but that little extra thickness can make the difference between perfectly water-tight or not. I don’t want to risk any sweat getting inside the sensor.
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The difference in thickness is not a minor detail, as it affects each battery’s capacity (150 mAh for the CR2025, 220 mAh for the CR2032). That’s why a CR2032 battery lasts significantly longer.
Yes, but that little extra thickness can make the difference between perfectly water-tight or not. I don’t want to risk any sweat getting inside the sensor.
I always use CR2032 for my H10 and have never seen any sealing issue
The funny thing that you both are right. Just different risk tolerances 
I also use the 2032 but I’m willing to take the risk. I know Polar says you should use the 2025, but the 2032 also clicks shut, and I haven’t had any issues. I was also swimming with the H10 in the beginning.
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Hi.
I said I’d be back with an answer.
I did a little training this afternoon and ‘Ra’… started to display
That is, @Inigo’s referring me to the “AlphaHRV” underpinnings description page and my subsequent dabbling on the subject and correlating the lack of “Ra” display with the Zwift - GarminConnect unpairing and re-pairing" was the cause.
I wish everyone a Merry Christmas, Hallelujah
Why on earth do they do this? Is it just to annoy their customers?
No, in the last update for H10, all setting will be save to a eeprom memory, but before that, all settings was saved only on memory, that reason because you quit battery from chest strap, all settings was erased
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Hi guys,
I’m interested about HRV to improve my recovery tracking !
Due to the price of the HRM Garmin since few years, i made the choice to use a classical HRM like a Xoss one with ANT+ or BLE. I take only the HRM+ for running (dynamics) ; swimming (sea) and triathlon etc.
I prefer to use in ANT+ especially for bike because i use in parallel watch (Fenix7) and GPS (edge 1040). With BLE, i can’t pair and use the HRM on two devices… 
I’ve tried to install the last version on Edge and on my Fenix. 0.100.19.
I’ve set the parameters as : ANT+, the nearest, it’s reported the ID of the last HRM (which is ok), 0 as the target id (to take the current etc).
I’ve added the AlphaHRV on the running screen, bike screen etc. But nothing is stored during the training.
I’ve tried to remove all HRM sensors, add again, restart the edge, restart the fenix etc.
Per example, yesterday, on a bike training with my Garmin HRM and on the edge :
Then, on a running after the riding with my watch Fenix and the Garmin HRM, again 0.
In the two cases, Garmin HRM is connected with ANT+.
This morning, on a bike training, with my Fenix and a XOSS HRM in ANT+, i have values !!!
I will take a look on the return bike way and on the edge to see if AlphaHRV has stored datas.
But in this case, the trouble is more focused on Garmin HRM+.
I don’t understand…
Did you set data recording on your edge to yes?
Also, what Edge are you using. 1020 and below may not work, AFAIK
Hi,
It is a 1040 one.
During the ride, i switch my Xoss HRM to BLE one. And it works.
When I switch to ANT+, no data.
What is the problem for me, is the HRM+ Garmin. With ANT+, I have no AlphaHRV datas on both equipment. Working on ANT+ with HRM Xoss one.
I don’t understand…
Per example, tonight with Xoss HRM on ANT+ on my Fenix on a recovery ride.
EDIT : yes, it is set on ON for all except frequency rate because it is already store.
On both equipment.
Hello!!
Reading your comments, I think there’s some confusion about how you’re connecting your devices and how the data is being obtained from the CIQ Alpha HRV.
Alpha HRV requires a dedicated channel for use, regardless of the connection to the watch or bike computer, and it must be the opposite of the connection you have with those devices.
For example, using the Garmin HRM+
The Garmin HRM+ will connect to the Fenix watch via ANT+.
So in the Connect IQ app, when you go to DataFields and select AlphaHRV, you will choose a different connection type than the one used to connect the Garmin HRM+ to the watch. In this case, you should choose Bluetooth.
Garmin HRM+ (ANT+) >> Fenix Watch
Garmin HRM+ (Bluetooth) >> CIQ AlphaHRV Fenix Watch
Since you already have the Bluetooth channel occupied (unless you use the HRM ProPlus, which has 3 channels, you won’t be able to use it for another connection), you must use the ANT+ connection for the bike computer.
Garmin HRM+ (ANT+) >> Edge 1040
As far as I know, the AlphaHRV can only connect to one device per connection. If you have the AlphaHRV on both devices, it won’t work on both. You must choose one to save the information.
Now, the most recommended device, and the one I’ve read has been tested the most for using the CIQ AlphaHRV, is the Polar H10. I have an HRM Run, an HRM ProPlus, and the Polar H10, and so far, the one that always connects and gives me information without any issues (after updating to the latest version using Polar Flow) is the Polar H10.
The Garmin worked for me, but it didn’t always work, and I didn’t understand why. I’m using it for indoor training to measure cadence and pace on the treadmill.
I’d tell you to try connecting everything to the watch or the Edge first, as explained above, and then test it out. Then, add the other device.
I hope this helps.
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Oh !!! Thank you. It was very clear now.
I set ANT+ for HRM+ this morning, the idea is to have both connexion on GPS and Fenix. And I set ONLY on my Fenix AlphaHRV on Bluetooth.
And it works perfectly
Perfect!
I’m glad it helped you. But I understand that in the future, if you’re going to be using the CIQ AlphaHRV frequently, you should change the HRM you’re using to the Polar H10, as it’s the most widely used HRM. In addition, in many tests, the HRV data has been more reliable than the Garmin, although there are no discernible differences with the heart rate data.
Likewise, check the position of the HRM when you put it on and try using different positions so that the number of artifacts is always less than 1%.
OK, i’ll keep on my mind. Thanks. Currently, i prefer Garmin HRM for Runnings Dynamics ;). But in case of failure why not !
I also have the heart rate strap, which also has Running Dynamics, but many of those values are already calculated by the watch itself (I currently have a Fenix 7s Pro). The only data the watch can’t calculate is the Ground Time Balance for each foot, but it already has it for everything else.
So if you mostly use the bike, even a Garmin HRM Dual or HRM 200 (the same dual but with support for encrypted connections) will work without problems.
The metrics for indoor workouts are provided by the Favero Assioma, which I use as pedals. These connect to the watch via ANT+ and allow me to store all the metrics it can collect.
To be clear, at this time, due to the price of a HRM Garmin, i don’t want to change it quickly lol…
For indoor training (bike), i’m using an Coospo HRM optical one.
For indoor training (run), i’m using the Garmin One with lap estimation (watch is too false…)
For triathlon, i’m using the Garmin for swim etc. More simple 
In the future, if the Garmin will not works, i will buy the good one.
Perfect!! Thats great.
Anything I could do to help, let me know! 
On the ‘H10’ you have firmware 3.10?
Where and how did you download it from?
Via ‘Polar Beat’ you can see that the latest firmware for the ‘H10’ is v3.3.1.
On the other hand, from ‘PolarFLow’ it informs you of a supposedly new firmware version (it does not display its number) at the same time it is not possible to … install it
I have in my ‘H10’ firmware v3.3.1, I have not heard of anything newer.
‘Polar’ itself also does not know about firmware v3.10 for the “H10” sensor: