Enduro 4 and Fenix 9 Pro Solar run the same Garmin training, navigation and health features. Fenix 9 Pro Solar adds phone calls and voice commands from the wrist, a dive computer and an optional inReach version with satellite messaging and SOS. Enduro 4 lasts longer in every battery mode Garmin publishes, weighs 36g less and costs £799.99 / $899.99 against £1,029.99 / $1,199.99 for the 51mm Fenix 9 Pro Solar.
The key feature lists come from the official specs and are expanded on the Enduro 4 specifications and Fenix 9 Pro specifications pages.
Features on both watches
Both watches run the Fenix 9 generation of Garmin software, and Garmin has said much of it will carry over to existing watches as well.
Trail, ultra and hill running
- Grade-adjusted pace-based workouts set pace targets that change with the gradient.
- Course Planner adds cut-off times, rest plans, checkpoints and aid stations to a race course, and Up Ahead shows the distance to the next one during the race.
- ClimbPro shows the current and upcoming climbs on a loaded course.
- Trail Run VO2 Max, Hill Score and Endurance Score track fitness on varied terrain and over long efforts.
- Real-time Stamina estimates how much effort remains during an activity.
- Rucking workouts account for pack weight, which you can change during the activity.
Maps and navigation
- Preloaded TopoActive maps cover several continents, and both watches have 64GB of storage for more.
- Perspective view tilts the map to show the terrain ahead.
- Dynamic round-trip routing builds a loop of a chosen distance and rebuilds it when the athlete leaves the route.
- NextFork shows the distance to the next trail junction and the trail name.
- SkiView resort maps and 43,000 golf courses are preloaded.
Training and recovery
- Training Readiness and Training Status report whether the athlete is ready to train hard and whether recent training is productive.
- Daily Suggested Workouts and Garmin Coach plans cover running, cycling, strength and triathlon.
- Garmin Epic records and shares the health and performance data from a multi-day activity in one view.
- Running power, wrist-based running dynamics and Running Tolerance are included, with Running Economy and Step Speed Loss available through an HRM 600 strap.
- HRV Status, Sleep Coach and Body Battery track recovery.
Health and everyday use
- The Garmin ECG app checks for signs of atrial fibrillation in supported regions.
- Pulse Ox, skin temperature and Health Status track changes from the athlete’s usual range.
- Garmin Pay, music from Spotify, Deezer and Amazon Music, smart notifications and the Connect IQ store are on both watches.
- Incident detection sends a live location to chosen contacts through a paired phone.
- Both watches have a built-in LED flashlight.
Features only on Fenix 9 Pro Solar
Garmin lists these for the Fenix 9 Pro, and none appear on the Enduro 4 page.
- Phone calls from the wrist over Bluetooth, through a built-in speaker and microphone
- Voice command and access to the phone’s voice assistant
- A dive computer for scuba and apnea diving to 40m
- Colour Shift and Red Shift display modes
- On the inReach version, with an inReach plan: calls, texts, LiveTrack and weather over LTE without a phone, two-way satellite messaging, satellite weather, interactive SOS and Garmin Locate location sharing
Garmin’s Enduro 4 page lists one running feature absent from the Fenix 9 Pro launch sheet: rolling pace.
Battery life
Enduro 4 leads Fenix 9 Pro Solar 51mm in all eight modes that Garmin publishes for both watches. Figures in brackets include solar charging.
| Mode | Enduro 4 | Fenix 9 Pro Solar 51mm | Fenix 9 Pro Solar 47mm |
|---|---|---|---|
| Smartwatch | 36 days (90 days) | 30 days (57 days) | 21 days (34 days) |
| Low Power Watch Mode | 92 days (unlimited) | 52 days (291 days) | 37 days (119 days) |
| Activity Mode (Normal) | 80 hours (144 hours) | 75 hours (124 hours) | 54 hours (81 hours) |
| Activity Mode + Music (Normal) | 22 hours (25 hours) | 21 hours (23 hours) | 15 hours (16 hours) |
| Activity Mode (Max Battery) | 210 hours (unlimited) | 186 hours (1,000 hours) | 132 hours (740 hours) |
| Activity Mode (Extended Battery) | 120 hours (320 hours) | 100 hours (211 hours) | 71 hours (127 hours) |
| Activity Mode (Max Accuracy) | 60 hours (90 hours) | 54 hours (75 hours) | 38 hours (49 hours) |
| Expedition Mode | 77 days (unlimited) | 54 days (124 days) | 38 days (68 days) |
The gap is widest with solar charging. Enduro 4 is rated for 90 days as a smartwatch against 57 days, and for 320 hours of extended-battery GPS against 211 hours. Garmin’s solar figures assume 50,000 lux conditions, with three hours a day outside for the smartwatch figure, so athletes who train in winter, under tree cover or with a sleeve over the watch should plan around the figures without solar.
Without solar, the two 51mm watches are closer. The Enduro 4 is rated for 36 days versus 30 days as a smartwatch, and for 80 hours versus 75 hours of GPS in normal activity mode. The site’s sports watch battery life guide and the Garmin battery life deep dive explain how it achieves these numbers.
Weight, size, connectivity and price
| Enduro 4 | Fenix 9 Pro Solar 51mm | Fenix 9 Pro Solar 47mm | |
|---|---|---|---|
| Price at launch | £799.99 / $899.99 | £1,029.99 / $1,199.99 | £949.99 / $1,099.99 |
| Price with inReach | Not offered | £1,199.99 / $1,299.99 | £1,029.99 / $1,199.99 |
| Size | 51mm (large) | 51mm (large) | 47mm (medium) |
| Weight | 66g | 102g | 84g |
| Case | Fibre-reinforced polymer, titanium bezel | Titanium | Titanium |
| Connectivity | Bluetooth, ANT+, Wi-Fi | Bluetooth, ANT+, Wi-Fi; LTE and satellite on the inReach version | Bluetooth, ANT+, Wi-Fi; LTE and satellite on the inReach version |
Enduro 4 weighs 66g with its ComfortFit fabric band, which is 36g less than the Fenix 9 Pro Solar 51mm. That saving is noticeable on the wrist over a 100-mile race or a week on the trail. The Fenix 9 Pro uses titanium throughout, while the Enduro 4 uses a fibre-reinforced polymer case with a titanium bezel.
Enduro 4 comes only in the large 51mm size. The Fenix 9 Pro Solar 47mm is the medium alternative at 84g, and its smaller case is rated for 21 days as a smartwatch and 71 hours of extended-battery GPS without solar, about 40% less than Enduro 4 in both modes.
Which to buy
Enduro 4 suits ultra runners, multi-day hikers and expedition users who want the longest gap between charges and the lightest large Garmin with maps. It costs £230 / $300 less than the Fenix 9 Pro Solar 51mm and has the same training and navigation features.
The Fenix 9 Pro Solar suits athletes who dive, take calls or use voice commands from the wrist, or want a titanium watch for daily wear. It is also the only choice of the two for a smaller wrist. The wider Garmin Fenix range also offers AMOLED versions of the same watch for those who prefer a brighter display over solar charging.
Satellite safety changes the sums. The Fenix 9 Pro Solar inReach 51mm costs £1,199.99 and adds messaging and SOS to the watch. Garmin sells the separate inReach Mini 3 Plus for £439.99, so Enduro 4 with that communicator costs £1,239.98 and means carrying a second device, although many ‘pro’ users prefer the second device.
Garmin Enduro 4
Course Planner, TopoActive maps and Garmin Epic, with up to 320 hours of solar GPS, 64GB storage and a 66g case.
Garmin Fenix 9 range
Every Fenix 9 and Fenix 9 Pro model, including AMOLED, Solar, and inReach variants across all sizes. One link to the full range.
Quick answers
Does Enduro 4 have the same features as Fenix 9 Pro Solar?
The training, navigation and health features are the same on Garmin’s launch pages, including Garmin Epic, grade-adjusted pace-based workouts, rucking workouts, TopoActive maps and the ECG app. Garmin lists phone calls from the wrist, voice command, a dive computer and inReach versions for Fenix 9 Pro, and none of those appears on the Enduro 4 page. The full lists are on the Enduro 4 specifications and Fenix 9 Pro specifications pages.
Is Enduro 4 battery life better than Fenix 9 Pro Solar?
Yes. Garmin rates Enduro 4 for up to 36 days as a smartwatch, or 90 days with solar, against 30 days and 57 days for Fenix 9 Pro Solar 51mm. In extended-battery GPS mode the figures are 120 hours, or 320 hours with solar, against 100 hours and 211 hours.
Can Enduro 4 make phone calls or send satellite messages?
Garmin’s Enduro 4 page lists neither. Fenix 9 Pro has a speaker and microphone for Bluetooth calls, and its inReach version adds LTE and two-way satellite messaging with an inReach plan. Enduro 4 can use the Garmin Messenger app through a paired phone.
How much lighter is Enduro 4 than Fenix 9 Pro Solar?
Enduro 4 weighs 66g with its band, and Fenix 9 Pro Solar 51mm weighs 102g, a difference of 36g. Fenix 9 Pro Solar 47mm weighs 84g. These are the weights on Garmin’s spec sheets.
Does Enduro 4 come in a smaller size?
No. Garmin sells the Enduro 4 in one size: 51mm. Fenix 9 Pro Solar comes in 47mm and 51mm, and the 47mm watch is rated for 21 days as a smartwatch, or 34 days with solar.
How much does Enduro 4 cost compared with Fenix 9 Pro Solar?
Enduro 4 launched at £799.99 / $899.99. Fenix 9 Pro Solar launched at £949.99 / $1,099.99 for 47mm and £1,029.99 / $1,199.99 for 51mm, so Enduro 4 is £230 / $300 cheaper than the 51mm watch. These are Garmin’s launch prices.
Last Updated on 6 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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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
