In 2025, Garmin Enduro 2 lasts longest: up to 34 days per charge, 46 days with solar, and 77-172 days in expedition. For non-solar endurance, COROS Vertix 2 reaches up to 60 days. These outlast Apple Watch 11 and Samsung Galaxy Watch 8 by a wide margin.
Why battery endurance varies so much in 2025
Battery life hinges on display tech, GPS accuracy modes, processor efficiency, and watch size. Transflective MIP screens sip power, while bright AMOLED panels draw more. Solar charging on select Garmin models meaningfully extends runtime outdoors.
Display technology and always-on settings
MIP displays stay visible in sunlight and use little energy, ideal for multi-week endurance. AMOLED looks richer but consumes more, especially with always-on display enabled. Turning always-on off typically saves 20-30 percent battery in daily use.
GPS profiles, sample rates, and antennas
Multi-band, multi-frequency GPS improves accuracy in cities but can cut battery by 20-40 percent versus single-band. Max Battery or UltraMax GPS profiles lower sample rates to multiply runtime. Smart recording and antenna design also affect drain during long activities.
What smartwatch battery lasts days?
For all-around, non-solar battery longevity, COROS Vertix 2 remains a standout at up to 60 days of regular use. For absolute maximum endurance, Garmin Enduro 2 leads: 34 days smartwatch mode, 46 days with solar, and up to 77-172 days in expedition. Garmin Instinct 2X Solar can achieve unlimited smartwatch runtime with sufficient sun.
Garmin Enduro 2 - the endurance benchmark
Smartwatch mode lasts up to 34 days indoors, extending to 46 days with solar. GPS runs up to 110 hours, or 150 hours with solar, and Expedition mode stretches to 77-172 days. A lightweight titanium build and MIP display enable sustained performance on multi-week expeditions.
COROS Vertix 2 - longest non-solar battery
Regular use reaches up to 60 days per charge, still unmatched without solar assistance. Full GPS extends up to 140 hours, with UltraMax GPS up to 240 hours for thru-hikes. A large 1.4 inch screen and efficient OS keep power consumption low.
Garmin Instinct 2X Solar - unlimited with sunlight
In smartwatch mode, the 2X Solar can deliver unlimited battery given adequate 50,000 lux exposure. Without solar, it still hits roughly 40 days, far beyond mainstream watches. Rugged construction and MIP display make it an ultra-reliable adventure pick.
Which smartwatches have multi-day battery life?
Several outdoor and fitness watches comfortably last a week or more. Garmin Fenix 7X Pro Solar reaches 28 days, or 37 with solar, while Epix Pro 51 mm can approach a month with restrained settings. Amazfit T-Rex Ultra targets up to 20 days and Huawei Watch GT 4 pushes up to 14 days.
Garmin Fenix 7X Pro Solar
Expect up to 28 days in smartwatch mode, extended to 37 days with solar. All-systems GPS can still exceed full weekend use, with Max Battery profiles stretching into triple digits of hours. It balances mapping, training metrics, and stamina exceptionally well.
Garmin Epix Pro 51 mm - AMOLED, but efficient
With the display set to raise-to-wake, Epix Pro 51 mm can reach up to 31 days. With always-on enabled, typical use falls closer to 10-16 days depending on settings. It shows that AMOLED can last weeks if you tune features carefully.
Amazfit T-Rex Ultra and Huawei Watch GT 4
Amazfit T-Rex Ultra targets up to 20 days typical and up to roughly 80 hours continuous GPS. Huawei Watch GT 4 claims up to 14 days on larger sizes, around 7 days on smaller. Both offer long endurance for their price and feature set.
How Apple Watch and Samsung compare
Apple Watch 11 is rated for about 18 hours of normal use, rising to up to 36 hours in Low Power Mode. Apple Watch Ultra 2 pushes up to 36 hours standard and up to 72 hours in Low Power Mode. These remain premium all-rounders, not endurance kings.
Apple Watch 11 and Ultra 2 - practical figures
Fast charging gets you from 0-80 percent in about 45 minutes on recent Apple Watches. Outdoor workout battery can reach around 7 hours on GPS-intensive sessions. If you own an Apple Watch, refresh your look with our apple watch straps and pick up spares from accessories apple watch.
Samsung Galaxy Watch 8 and 8 Classic
Typical runtime lands around 30-40 hours depending on size, LTE, and always-on. With Power Saving enabled, many users see 2-3 days between charges. Advanced bio-sensors and bright displays cost power, but careful settings can double endurance.
Battery life leaderboard - 2025 snapshot
The table below highlights real-world manufacturer claims for leading long-lasting models. Actual results vary with features used, display settings, and environment. Solar figures assume strong outdoor light during the day.
| Model | Smartwatch mode | Extended or solar | GPS mode | Notes |
|---|---|---|---|---|
| Garmin Enduro 2 | Up to 34 days | 46 days solar | Up to 110-150 hours | Expedition 77-172 days |
| COROS Vertix 2 | Up to 60 days | N/A | Up to 140-240 hours | UltraMax extends further |
| Garmin Instinct 2X Solar | Unlimited with sun | About 40 days no sun | Up to 60+ hours | Rugged, MIP display |
| Garmin Fenix 7X Pro Solar | Up to 28 days | 37 days solar | Up to ~89-122 hours | Flagship multisport |
| Garmin Epix Pro 51 mm | Up to 31 days | 10-16 days typical | Up to ~82 hours | AMOLED, efficient modes |
| Amazfit T-Rex Ultra | Up to 20 days | N/A | Up to ~80 hours | Great value endurance |
| Huawei Watch GT 4 | Up to 14 days | 7 days smaller size | Up to ~30 hours | Balanced features |
| Samsung Galaxy Watch 8 | ~30-40 hours | 2-3 days power saving | Up to ~20 hours | Bright OLED display |
| Apple Watch 11 | ~18 hours | Up to 36 hours LPM | ~Up to 7 hours | Fast charge support |
Top picks at a glance
If you want the longest battery with minimal compromises, these are safe choices. Each balances endurance with features suited to different users. Pick according to terrain, sensors, mapping, and your display preference.
- Garmin Enduro 2
- COROS Vertix 2
- Fenix 7X Pro
- Instinct 2X Solar
Real-world ways to extend battery
Disable always-on display and lower brightness for immediate savings. Use single-band GPS unless you need urban canyon accuracy. Turn off continuous SpO2 and reduce background app sync intervals.
Activity tracking strategies
For multi-day treks, switch to Max Battery or UltraMax GPS profiles. Preload maps via Wi-Fi to reduce on-the-fly data pulls. Keep wrist-raise sensitivity conservative to avoid unnecessary screen activations.
Frequently asked questions
Which smartwatch lasts longest on one charge?
Garmin Enduro 2 lasts the longest overall, especially with solar and expedition modes. For non-solar typical use, COROS Vertix 2 can reach up to 60 days. Both surpass mainstream AMOLED smartwatches by a wide margin.
How close are Apple and Samsung now?
Apple Watch 11 targets about 18 hours, or up to 36 hours in Low Power Mode. Apple Watch Ultra 2 reaches about 36 hours, up to 72 hours in Low Power. Samsung Galaxy Watch 8 series generally runs 30-40 hours, extendable to a couple of days with power savings.
Can AMOLED watches truly last weeks?
Yes, but only with careful settings and larger batteries. Garmin Epix Pro 51 mm can approach a month with raise-to-wake and limited background features. Always-on display will cut endurance significantly.
Does solar charging really make a difference?
On solar-enabled Garmins, expect roughly 15-30 percent gains in sunny conditions. Multi-week treks benefit most because daily exposure compounds over time. Expedition profiles plus solar can stretch battery into months on Enduro 2.
Conclusion
The smartwatch with the longest battery life in 2025 is Garmin Enduro 2, delivering up to 34 days per charge, 46 days with solar, and 77-172 days in expedition. For non-solar longevity, COROS Vertix 2 holds the crown at up to 60 days. If you need true multi-week endurance, these are the clear winners.
