Garmin Instinct 3 45mm Solar

Name: Garmin Instinct 3 45mm Solar
Brand: Garmin

Garmin Instinct 3 45mm Solar is a GPS sports watch released in January 2025. Key specs: case size 45 mm, screen size 1.27″, battery life (smartwatch mode) 28 days, GPS battery life 40 h.

5.6Score

Display2.6

Battery life7.6

Health tracking4.9

Sports & outdoor6.2

Build & durability5.8

price range$310–390

Full specifications

Released: January 2025
Type: GPS sports watch
Brand: Garmin
Popularity: #215 of 796
Model numbers: Instinct 3 – 50 mm, AMOLEDInstinct E – 45 mmInstinct E – 40 mmInstinct 3 – 50 mm, SolarInstinct 3 – 45 mm, AMOLED

45 mmCase size

1.27″Screen size

NoAMOLED / OLED display

28 daysBattery life (smartwatch mode)

40 hGPS battery life

10 ATMWater resistance

52 gWeight

YesNFC payments

Spec guide

How it ranks among GPS sports watches of 2025

Spec guide

Screen size · 1.27″Bottom 15%Battery life (smartwatch mode) · 28 daysTop 8%GPS battery life · 40 hTop 50%Water resistance · 10 ATMTop 17%Weight · 52 gBottom 43%

Compared with GPS sports watches released in 2025. Bars show the share of models it beats.

compared with other GPS sports watches

Why is Instinct 3 45mm Solar a good choice?

Battery life (smartwatch mode): 28 daysbetter than 88% of GPS sports watches

Weight: 52 gbetter than 72% of GPS sports watches

Battery saver mode: 65 daysbetter than 80% of GPS sports watches

In rankings

#23Longest battery life #17Longest battery in power-saving mode

Specifications

Full specifications

Design & durability

Case size: 45 mm
Weight: 52 g
Thickness: 14.9 mm
Height: 45 mm
Width: 45 mm
Case material: Aluminium
Sapphire crystal: No
Lens / cover glass: Power Glass™
Strap material: silicone
Water resistance: 10 ATM
Water rating (maker): 10 ATM

Display

Screen size: 1.27″
Display technology: Memory-in-pixel (transflective)
Panel: Monochrome, sunlight-visible, transflective memory-in-pixel
AMOLED / OLED display: No
Always-on display: Yes
Resolution (width): 176 px
Resolution (height): 176 px
Pixel density: 139 ppi

Battery

Battery life (smartwatch mode): 28 days
Battery saver mode: 65 days
GPS battery life: 40 h
GPS battery life (dual-band): 24 h
Battery type: Lithium ion
Solar charging: Yes
Wireless charging: No
Charging: Garmin proprietary plug charger

Health sensors

Optical heart rate: Yes
Blood oxygen (SpO2): Yes
Temperature sensor: Yes
HRV tracking: Yes
Sleep tracking: Yes
Sensors: GPS, GLONASS, Galileo, SatIQ technology, Elevate wrist heart rate monitor, Pulse Ox blood oxygen saturation monitor, Barometric altimeter, Compass, Gyroscope, Accelerometer, Thermometer

Sports & navigation