Software Update 2.48.16 (2025 November Rain release)

2b2bff

Today I have to join the “my watch didn’t track my sleep” club. Interestingly it stopped recording HR and resources shortly after I set DND mode yesterday evening and resumed recording after I took it off for a shower in the morning. No sleep tracking, no resources, no heart rate. Very strange this.
About an hour ago I looked at the watch from the side and saw green and red light coming from the HR sensor. But it should only record ox during night?

gone troppo

My watch only has one sensor connected and has only ever had one sensor Connected which is polar h10. I don’t know what is causing the battery drain but it started a long while back. Interestingly when I do a soft reset and then select an activity my heart rate sensor is still there paired I never have to re pair it ? I thought this was a bit suspicious. I have had the vertical since it was released my settings are always the same since the beginning very conservative.

No notification
No pulse ox
24 hour heart rate tracking on
Sleep tracking on
Backlight to lowest setting
No raise to wake or anything like that
I try to keep all settings as conservative as possible.

When I bought the watch it would go almost 4 weeks from 80% to 20% with around 12 hours activity a week both indoor and outdoor.

Kraisun Tunta

As a concrete case, last night I charged the watch to “100%” at 21:00 and wore it during sleep as usual. By morning, the battery had dropped to 95%, representing a 5% overnight drain. Under identical conditions, the normal overnight consumption is typically around 1%.

This deviation strongly suggests that the battery was not truly at a full state of charge when the system reported 100%. A more realistic estimation is that the actual battery voltage was likely closer to 96%, while the software prematurely capped and displayed it as 100%.

This reinforces the hypothesis that the current SOC algorithm is overestimating charge level due to calibration thresholds or coulomb counter drift, resulting in a misleading full-charge indication and an abnormal discharge pattern immediately after.

In practical terms, the system is reporting “logical 100%”
but the battery is operating at “electrical 96%”.

This mismatch is not a matter of user perception, but a measurable inconsistency between displayed SOC and real battery behavior.

Pavlas

My last day with sleep tracking, notifications, and no activity—3% battery gone. I’m satisfied.

Horizontal_2

@Kraisun-Tunta I really would like to do some electronical engineering with this device.

So all the problems could be related to wrong measurements?

Would it be usefull to charge the watch for a few hours instead of take it off at 100%?

Kraisun Tunta

@Horizontal_2 Keeping a lithium-ion battery at 100% for extended periods increases float voltage stress and high SOC dwell time, which accelerates calendar aging and long-term capacity fade.

Potential benefit of short post-100% charging
Better voltage stabilisation
Improved SOC calibration
Reduced initial phantom drop

Downsides of prolonged charging
Increased electrochemical stress
Faster degradation over time
Reduced overall battery lifespan

Reality check:This is an engineering trade-off, not a defect.

And honestly? Don’t overthink the battery.
All AMOLED-based smartwatches across brands operate within very similar battery degradation envelopes. The differences are marginal, not life-changing.

Obsessing over 1–5% variance is chasing noise, not performance.

Use the watch. Train. Sleep. Enjoy.
Let physics do its job.

Horizontal_2

@Kraisun-Tunta Thanks! This is helpful!

I guess I’m a little bit obsessed with the battery right now. I still think the drain is too high at some points. First I thought it was a hardware defect. Now I think it’s a software defect. Maybe less running with HR-belt will help

Next cycle I’m going to throw the battery status off the watch. Do’nt wanna know till I’m at 20%

GuillaumeA

Since Tuesday, 18/11/2025, I have switched back to Race 2 with the latest software.

In terms of activities, I did: 5 hours of outdoor sports in performance mode (without AOD and with external HR) + 45 minutes indoors without GPS. Starting from a 100% charge.

I am currently at 75% battery (i.e. just under 8% battery/day consumed with these activities). This is better than the Vertical 1, without a doubt. I find the battery life on the Race 2 quite impressive. And for me, it is very close to the specs.

In terms of daily settings: no notifications, 24/7 HR, sleep tracking + VFC, low brightness, turn to wake up.

Fun fact: at night, the Race 2 consumes 1% of battery. The Vertical consumes 3/4%. While the settings are strictly the same, there is one slight difference: the AMOLED is always off when the MIP works once a minute to update the time.

sorinus

@GuillaumeA said in Software Update 2.48.16 (2025 November Rain release):

Fun fact: at night, the Race 2 consumes 1% of battery. The Vertical consumes 3/4%. While the settings are strictly the same, there is one slight difference: the AMOLED is always off when the MIP works once a minute to update the time.

if there is no movemement (at night), the MIP is going quickly in power save mode (black).

Kraisun Tunta

@Horizontal_2 I might say Suunto’s battery calculation and power management could use some… “character development” —
but I enjoy my current unblocked lifestyle

Let’s just put it this way:
If battery management were an Olympic sport, Suunto wouldn’t be last…
but it definitely wouldn’t be giving the gold medal speech either.

duffman19

@Kraisun-Tunta said in Software Update 2.48.16 (2025 November Rain release):

Obsessing over 1–5% variance is chasing noise, not performance.

Use the watch. Train. Sleep. Enjoy.

I appreciate the above discussion on battery tech and completely agree with @Kraisun-Tunta that obsessing over small fluctuations in percentages is meaningless. However, some of us are still experiencing significant battery draws that cannot be explaining by small variations in battery algorithms.

Last night, my 9PP went from 72% to 59% over the course of ~8 hours of sleep. Typically I’ll see a drain of 2-3% overnight. This was not the result of a “false 100%” reading after a charge, but more likely caused by unwarranted background activity.

If bad battery calculations were the cause, then wouldn’t we also see periods of surprising battery stability or non-draining events? I have yet to observe this.

Brad_Olwin

@Kramble I exercise everyday so that really isn’t possible. I often wear 2 watches but most of my testing is for Suunto releases.

Calando

@pavel.samokha Just tried to use user-defined pace zones with my Race 2 (SW version 2.48.16). I found that as soon as I change the predefined zone limits in ‘Settings’ > ‘Training’ > ‘Intensity zones’ > ‘Advanced zones’ > ‘Running’ > ‘Pace zones’, I cannot select pace zones for trainings anymore.

After changing the zone limits, the possible selections in the ‘Running’ > ‘Exercise options’ > ‘Intensity zones’ menu do not include the ‘Pace zones’ item anymore.

A soft reset of the watch resets the pace zones to the default values (which unfortunately are much too fast for me yet) and re-enables the ‘Pace zones’ menu entry in the ‘Running’ > ‘Exercise options’ > ‘Intensity zones’ menu.

This means that for now, I can only remember my pace zone limits and look at the watch often…!?

Frederick Rochette

I thought the issue had been resolved following the latest SV2 update, but after 10 days of use and very little activity, I notice that I am already at 9% battery, which is not in line with what SUUNTO had announced. I think I will end up sending the watch back to customer service.

Milan Šádek

@Frederick-Rochette I’m in this game as well. My SV battery has dropped from 98 to as low as 38% in 4 days only. I have not used it too much, just an hour a day with GPS activity. But one day I also used H10 belt, which I suspect caused this drain.

The_77

@pavel.samokha small bug with the morning report. Despite the existence of the “x” on the right hand side, a few of the different sceoll positions don’t allow you to actually exit the report with a click of the middle button.

Edit/ checked this morning, total sleep time, deep and awake all don’t actually let you click to exit.

Oh and one more - if you get a notification whilst in the stopwatch menu whilst it is running, the “x” button disappears, and you can only exit via a long press of the middle button. Bit harder to reproduce but has been an issue for a while.

gkaempfer

Vertical 2 battery with:
AOD on
Raise to wake - off (I get the dim AOD and need to press a button for more)
HR on 247, sleep tracking with HRV without spo2
Auto DND 22:00-5:40 (night mode with display off)
Brightness low
Wireless off
Discovery off
Notifications on (quite a few)
No external BT devices except for the app (Android phone)

Charged to 100% but without extra time so after first night was down to 96% (normally down 1% per night).
After 8 full days was down to 14% including slightly more than 15 hours of GPS activities (running and biking).
From more detailed measurements I conclude roughly:
2% per GPS activity hour
1% per night.
6% for the rest of the day (16:30 hours) without activities.

I could have stretched 9 days out of the battery with almost two hours of GPS activity.

I believe that the AOD costs me about 2% per day. Next I intend to benchmark AOD off with R2W display only. I believe I can get down to 5% per day without activities (which is according to specs) and with two hours of GPS per day I could stretch out 10 or maybe even 11 days of battery life.

I guess that’s about what one should expect from the watch.

Audaxjoe

@Gideon-Kaempfer I’m getting 10 days between charges. AOD but screen not active. No 24h heart rate or sleep tracking. Notification on.

10 or so hours of GPS and also a similar amount of activities without GPS.

I’m pleased with the battery. The screen is so nice and much easier to read for my ageing eyes.

And Suunto have sorted out the charger.

TiaanvD

@Tsubasa said in Software Update 2.48.16 (2025 November Rain release):

I have SV2 2.48.16 and have the same problem about Blood Oxygen. The day before yesterday I updated firmware and it was able to measure manually. Also it could measure well while sleeping. But today SpO2 indicates 90% during sleeping. And I can’t measure SpO2 manually again. I tried many times but keeping silence. I redid firmware update “2.48.16.26426” from the debug menu. Currently, SpO2 measuring seems to work well. But I think it will crash again in 2 days.

Thanks this helped me fix my manual blood oxygen, was unable to do it manually until I reinstalled the firmware.

elbee

@Audaxjoe said in Software Update 2.48.16 (2025 November Rain release):

The screen is so nice and much easier to read for my ageing eyes.

I read that from more people, and I have actually the opposite: due to the high resolution, smaller fonts can be used, and all watch manufacturers do just that. This morning, I didn’t have my reading glasses and accidentally selected my running interval profile for a long run. Not a big deal, I just don’t get 1k auto lap notifications, but it’s just something that never happened with watches with a mip display, because fonts couldn’t be that small.
(Not a fan of amoled.)