Garmin says its Enduro 4 can run for up to 90 days in smartwatch mode or up to 320 hours in an extended-battery activity mode when specified solar conditions are met. Apple rates Apple Watch Ultra 4 for up to 50 hours of normal use and up to 45 hours in Max Extended Workout. Those figures make Garmin’s endurance claim striking, but they are manufacturer estimates for different modes and conditions—not results from a direct comparison.
How much longer does the Enduro 4 claim to last?
Garmin announced the Enduro 4 on October 6, 2026, calling it its longest-lasting GPS smartwatch with solar charging. The company’s headline maximums are up to 90 days in smartwatch mode and up to 320 hours in activity mode. Both depend on solar exposure and specified settings, so neither is a typical-use guarantee. Garmin’s announcement provides the estimates and their assumptions.
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- Smartwatch mode: Up to 90 days, assuming all-day wear and three hours per day outdoors in 50,000 lux conditions.
- Activity mode: Up to 320 hours of continuous use in 50,000 lux conditions, with the extended-battery activity setting selected.
These are maximum estimates tied to conditions, not a promise that every owner will see the same runtime. The activity figure also depends on selecting the extended-battery setting.
How do the Apple Watch Ultra 4 figures compare?
Apple lists up to 50 hours for Apple Watch Ultra 4 in normal use and up to 84 hours with Low Power Mode. For workouts, it lists up to 25 hours in Extended Workout and up to 45 hours in Max Extended Workout. Apple says Max Extended Workout continues to take GPS readings every second. See Apple’s Ultra 4 announcement and its technical specifications.
#1 Best Overall
- The 1.4” Power Sapphire lens harvests the sun’s energy, giving you more power and time between charges
- AutoSelect mode uses SatIQ technology to dynamically determine the GPS mode necessary to maximize battery life without compromising positional accuracy
- The rugged, lightweight design won’t slow you down, and the light UltraFit nylon band provides a secure, comfortable fit during all of your activities
- Navigation tools help you find your way with preloaded TopoActive and ski maps
- A superbright LED flashlight (twice as bright as the fēnix 7X multisport GPS watch) offers variable intensities with a strobe that matches your running cadence; red safety light mode helps you keep an eye on your immediate surroundings while running at night
| Use case or mode | Garmin Enduro 4 | Apple Watch Ultra 4 |
|---|---|---|
| Everyday smartwatch use | Up to 90 days in smartwatch mode, assuming all-day wear and three hours outdoors per day in 50,000 lux conditions (Garmin, 2026). | Up to 50 hours of normal use; up to 84 hours in Low Power Mode (Apple, 2026). |
| Activity or workout tracking | Up to 320 hours in activity mode, with continuous use in 50,000 lux conditions and the extended-battery activity setting selected (Garmin, 2026). | Up to 25 hours in Extended Workout or up to 45 hours in Max Extended Workout; Apple says the latter takes GPS readings every second (Apple, 2026). |
The numbers are not a controlled, like-for-like test. Garmin’s maximums depend on solar exposure; Apple’s listed use and workout modes have different configurations. A longer advertised maximum does not show how either watch performs in a particular person’s daily routine or workout.
What the Enduro 4 offers beyond battery life
Enduro 4 is a 51 mm GPS smartwatch with a 1.4-inch MIP display and solar lens. Garmin lists a 66 g weight, 10 ATM water resistance and 64 GB of memory. Its announced features include more than 100 activity profiles, grade-adjusted pace tools, stamina zones and curve, Garmin Epic multiday activity logging, built-in routable maps and a white-and-red LED flashlight. It ships with a ComfortFit Fabric Band with QuickFit functionality. These are Garmin’s specifications and feature claims, not independent evaluations. Garmin’s product announcement has the full list.
Rank #2
- Designed for ultra-endurance athletes, with a lightweight design weighing just 63 g to help improve performance
- Take on the elements with a titanium bezel, scratch-resistant sapphire lens and built-in LED flashlight to light up the dark; UltraFit nylon band provides long-distance comfort - even in punishing conditions
- Up to 90 days of battery life in smartwatch mode (assumes all-day wear with 3 hours per day outside in 50,000 lux conditions) and 320 hours in GPS mode with solar charging (assumes continuous use for entire period in 50,000 lux conditions) - all with an always-on display, so you’re ready to take on the toughest challenges
- Preloaded TopoActive maps are optimized for outdoor activities to help keep your adventures on track
- Dynamic round-trip routing allows you to set a target destination for your run, bike or hike; Enduro 3 will continually adjust the route to get you back home on schedule
Which watch makes more sense for you?
Battery life is one decision point, not a complete verdict on either watch. The Enduro 4’s solar-dependent estimates and multiday activity emphasis are relevant if long stretches between charging matter to you. Apple’s published figures separate ordinary use, Low Power Mode and two workout modes, which helps frame its runtime around different use patterns. Apple also highlights its Health Sensing System, S11 chip and readiness feature for Ultra 4 in its announcement.
The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Garmin says Enduro 4 is available now at a suggested retail price of $899.99. That is Garmin’s suggested price, not a guarantee of the price at every retailer. The available manufacturer figures do not establish a shared test protocol or an independent side-by-side result, so compare the modes and conditions that match your own use rather than treating the largest numbers as directly equivalent.
Quick Recap
Best Value
- Smartwatch with a bright, colorful display, stainless steel design, and built-in flashlight; up to 12 days of battery life gives a more complete picture of your health - physical size - 45 x 45 x 12.5 mm, Fits wrists with a circumference of 135-200 mm
- Make improvements to promote a healthier lifestyle and know your body better with extensive health monitoring features, including wrist-based heart rate, Body Battery energy monitoring, fitness age, stress tracking, meditation and more (device data presented is intended to be a close estimation of metrics tracked)
- Get a sleep score and personalized sleep coaching, including recommendations for how much sleep you need, tips on how to improve, alignment on your inner sleep cycle by using circadian rhythm and more; breathing variations feature uses Pulse Ox to check your level of variations while sleeping (this is not a medical device, and device data presented is intended to be a close estimation of metrics tracked; Pulse Ox is required and not available in all countries)
- The health status feature looks for changes in your health data that could indicate added stress to your body for key metrics — such as heart rate, HRV, skin temperature and more — which could be related to factors such as physical activity, potential illness or other health changes (device data presented is intended to be a close estimation of metrics tracked)
- Log custom or preset daily behaviors — such as caffeine and alcohol intake — and view reports in the Garmin Connect smartphone app on how lifestyle choices may impact your sleep, stress and HRV to help you make more health-conscious decisions (device data presented is intended to be a close estimation of metrics tracked)
Rank #4
- Designed for ultra-endurance athletes, with a lightweight design weighing just 63 g to help improve performance
- Take on the elements with a titanium bezel, scratch-resistant sapphire lens and built-in LED flashlight to light up the dark; UltraFit nylon band provides long-distance comfort — even in punishing conditions
- Up to 90 days of battery life in smartwatch mode (assumes all-day wear with 3 hours per day outside in 50,000 lux conditions) and 320 hours in GPS mode with solar charging (assumes continuous use for entire period in 50,000 lux conditions) — all with an always-on display, so you’re ready to take on the toughest challenges
- Preloaded TopoActive maps are optimized for outdoor activities to help keep your adventures on track
- Dynamic round-trip routing allows you to set a target destination for your run, bike or hike; Enduro 3 will continually adjust the route to get you back home on schedule
Rank #3
- Bundle Includes: Garmin Enduro 3, GPS Smartwatch, Carbon Gray DLC Titanium with Black Ultrafit Nylon Strap + USB type-c female adapter + USB Charging Adapter + Microfiber Cleaning Cloth + P-Bank Battery + Air Pro TWS Truly Wireless EarBuds - (Color may vary)
- Experience unrivaled battery life with solar power technology, providing up to 320 hours in GPS mode and 90 days in smartwatch mode. Perfect for ultra-endurance athletes, this watch offers continuous tracking and performance without frequent charging. Whether you're tackling multi-day races or extensive outdoor treks, the Enduro 3 ensures you stay powered throughout your adventure.
- Navigate with precision thanks to SATIQ technology and multi-band GPS, offering superior accuracy in the most challenging environments. Coupled with dynamic round-trip routing and preloaded TOPOActive maps, the Enduro 3 provides reliable guidance, making it the ultimate companion for long-distance runners, hikers, and off-road explorers who need dependable navigation to get back home on time.
- Illuminate your path with the built-in LED flashlight, featuring variable intensities and a red safety light for nighttime training or emergencies. Ideal for adventurers who push through the night, this feature enhances safety in low-light conditions. Combined with a range of trail-specific features and preloaded maps for ski resorts and golf courses, this watch is ready for any adventure.
- Built for the toughest challenges, the Garmin Enduro 3 features a lightweight 63g design with a durable titanium bezel and scratch-resistant sapphire lens. The ultra performance GPS smartwatch is ideal for athletes and adventurers pushing their limits, providing exceptional comfort with its UltraFit nylon strap. Go beyond your goals with a watch designed to endure the most extreme tests.
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