If you own a Galaxy Watch 8, keep it. The Galaxy Watch 9 looks the same, has the same screen, sensors, GPS, and storage, and Samsung claims the same battery life of up to 30 hours. Everything new in the software is coming to your watch as a free update. It is never worth replacing a twelve-month-old watch with its successor, and nothing here changes that.
If you are buying new, you have a real choice between a discounted Watch 8 and the Watch 9, and it comes down mostly to which size you wear. The small Watch 9 has a noticeably bigger battery than the small Watch 8. The large one does not.
I have tested neither watch. Everything below comes from Samsung’s own figures and announcements, not from my testing. The full numbers are on the Galaxy Watch 9 specifications page, and last year’s watch is covered in Galaxy Watch 8: everything you need to know.
What is new, and what is not
| Galaxy Watch 9 | Galaxy Watch 8 | |
|---|---|---|
| This year’s health features (Daily Cardio Load, Vitals, Fitness Index, Heart Health Score) | Yes, from day one | Coming by update. Samsung is testing it now |
| Running Coach, Energy Score, antioxidant reading | Yes | Yes |
| Better GPS in cities and under trees | Yes | Yes |
| Rotating bezel | No | On the Watch 8 Classic only |
| Battery life (Samsung’s claim) | Up to 30 hours | Up to 30 hours |
| Battery size, small watch | 390mAh, a fifth bigger | 325mAh |
| Battery size, large watch | 445mAh, barely changed | 435mAh |
| Chip | Qualcomm Snapdragon Wear Elite, new to Samsung | Samsung Exynos W1000 |
| Software when you unbox it | Wear OS 7 | Wear OS 6, with Wear OS 7 coming |
| Weight, small watch | 31.5g | 30.0g |
| Weight, large watch | 34.0g | 34.0g |
| Colours | Graphite, Cream (40mm), Silver (44mm) | Graphite, Silver |
| Classic model | None | Galaxy Watch 8 Classic, 46mm |
| On sale from | 7 August 2026 | 25 July 2025 |
| Launch price, small Bluetooth model | $379.99 / £349 | $349.99 / £319 |
Everything else is the same: the case sizes, the screens and their brightness, the sapphire glass, the aluminium body, the memory and storage, the health sensor, the GPS, the charging, payments, Wi-Fi and the water and toughness ratings.
Battery life: a bigger battery, the same claim
This is the change people ask about, and the honest answer is that Samsung has not claimed a longer runtime. It says up to 30 hours for both watches, in both sizes. The small Watch 9 has about a fifth more battery to draw on, and Qualcomm says its chip is more efficient.
Which size you wear decides how much this matters. The small Watch 8 had the smallest battery of any current Galaxy Watch, and people with smaller wrists had no other option. The small Watch 9 closes most of that gap, for an extra gram and a half. The large Watch 9 gains about 2 per cent, which nobody will notice.
Samsung does not say how many hours of GPS either watch records, so I cannot tell you from its figures whether a small Watch 9 will get you through a long ride with more to spare than a small Watch 8. What I can say is that a watch claimed at 30 hours gets charged every day, whichever generation you own.
Neither watch fast charges. Samsung’s support page says so for the Watch 9: about 80 minutes for the small watch and about 90 for the large. Samsung doesn’t list a charging time for the Watch 8. I cover the whole subject in Galaxy Watch vs Apple Watch charging speed.
A new chip, which you will not notice
The Watch 9 and the Ultra 2 are the first Galaxy Watches to use a Qualcomm chip instead of Samsung’s own. The two chips are built the same way, and the memory and storage have not changed. The only thing that would matter to a runner is whether the new chip uses less power during a GPS workout, and Samsung has not said.
Bluetooth goes up a version. Samsung has not tied any feature to it.
The new training features are software, and the Watch 8 is getting them
The Watch 9 launched with Daily Cardio Load, Vitals, Fitness Index, Heart Health Score, a warning when noise around you is loud enough to damage your hearing, and a better sleep apnoea check. Of these, Daily Cardio Load is the one a runner following a plan will use most: it tells you how hard your recent training has been and how much rest it needs.
None of this needs the new watch. The health sensor is the same in both generations, and the features belong to the software. Samsung started testing that software on the Watch 8 in late August 2026, beginning in South Korea, and has not given a date for the finished version. Running Coach, Energy Score, bedtime guidance and the antioxidant reading were already on the Watch 8 when it launched. My earlier pieces on Wear OS 7 and sport and Samsung’s Vitals alert explain what the software adds.
Looks, sizes and the missing Classic
Both watches come in the same two sizes with the same aluminium case. Samsung says the Watch 9 is slimmer and that its strap has air pockets for comfort, but the published case measurements match the Watch 8 to the tenth of a millimetre. Cream replaces Silver on the small watch.
There isn’t a Watch 9 Classic yet. The Watch 8 Classic was larger, with a rotating bezel, a bigger battery, and twice the storage; it sold from $499 or £449, and Samsung has not replaced it. I discussed what that means when the Galaxy Watch Ultra 2 designs leaked. If you want the rotating bezel, last year’s model is the only way to get it.
Should you upgrade?
Not from a Watch 8. The screen, sensors, GPS, storage, and claimed battery life are the same, and the software comes via updates.
The Galaxy Watch 8 still makes sense if
- You are buying the large size, where the battery is the same size for all practical purposes, and the Watch 8 is well below the Watch 9 price.
- You are happy to wait a few months for the new health features to arrive via an update.
- You want the rotating bezel, which only the Watch 8 Classic has.
The Galaxy Watch 9 makes more sense if
- You are buying the small size, where the battery is a fifth bigger for an extra gram and a half.
- You want the new software and health features on day one.
- The Watch 8 discount where you shop is small. At launch, the two were only $30 or £30 apart.
- You want the Cream finish.
If your watch is older than a Watch 8, the Galaxy Watch upgrade guide goes through each generation in turn. That is where an upgrade can make sense.
Samsung Galaxy Watch 9
Everyday health and fitness smartwatch
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Samsung Galaxy Watch8
Last year's everyday health and fitness smartwatch
+other retailers
Also considering the Galaxy Watch Ultra 2?
If battery life is why you are looking at a new Galaxy Watch, the Watch 9 does not change Samsung’s claim, and the Galaxy Watch Ultra 2 is the one to look at. It lasts twice as long between charges, charges faster, has a titanium case, works as a dive watch and connects to a cycling power meter, for roughly twice the price. See Galaxy Watch 9 vs Galaxy Watch Ultra 2 for this year’s two watches side by side, Galaxy Watch Ultra 2 vs Galaxy Watch Ultra for what changed at the top of the range, and Galaxy Watch Ultra 2 vs Apple Watch Ultra 4 for Samsung against Apple. Samsung’s figures come from its announcements for the Galaxy Watch 9 and the Galaxy Watch 8.
Quick answers
Does Galaxy Watch 9 have better battery life than Galaxy Watch 8?
Not on Samsung’s figures. It claims up to 30 hours for both watches. The Galaxy Watch 9 has a bigger battery: about a fifth larger in the small size and almost the same in the large size.
What is the battery capacity of Galaxy Watch 9?
390mAh in the 40mm watch and 445mAh in the 44mm. That’s about 20 per cent and 2 per cent bigger than the same sizes of the Galaxy Watch 8.
Is it worth upgrading from Galaxy Watch 8 to Galaxy Watch 9?
No. The screen, sensors, GPS, storage and claimed battery life are the same, and Samsung is bringing the new software to the Galaxy Watch 8. Replacing a twelve-month-old watch with its successor is not worth the money.
How much does Galaxy Watch 9 weigh?
31.5g in the 40mm size and 34g in the 44mm, without the strap. The small one is a gram and a half heavier than the small Galaxy Watch 8, and the large one weighs the same.
Is there a Galaxy Watch 9 Classic?
No. The Galaxy Watch 9 comes in 40mm and 44mm only. The Galaxy Watch 8 Classic, a 46mm watch with a rotating bezel, is the most recent.
Will Galaxy Watch 8 get One UI 9 Watch?
Yes. Samsung began testing it on the Galaxy Watch 8 in late August 2026, starting in South Korea, and has not given a release date.
What chip does Galaxy Watch 9 use?
The Qualcomm Snapdragon Wear Elite. The Galaxy Watch 8 uses Samsung’s own Exynos W1000. Both are built the same way, and Samsung has not said the new one lasts longer.
Last Updated on 2 October 2026 by tfk the5krunner
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Kineon MOVE+: Red light therapy for niggles. It works.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
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Written by real people, with AI assistance. Fact-checked and verified for originality. See the Editorial Policy. FTC: Affiliate Disclosure — some links pay commission. As an Amazon Associate, I earn from qualifying purchases.
tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors. ID
