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Garmin Forerunner 165 vs Garmin Forerunner 45

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

GarminForerunner 165GarminForerunner 45
Overview
ReleasedFebruary 2024May 2019
Display
Case sizes43 mm42 mm
PanelOLEDMemory-in-pixel
Always-on displayYesYes
Display detail1.2-inch (30.4 mm diameter) colour AMOLED touchscreen, 390 x 390 pixels; optional always-on display; five physical buttons1.04-inch (26.3 mm) sunlight-readable colour MIP display, 208 x 208 pixels, with button controls.
Screen protectionChemically strengthened glassChemically strengthened glass.
Health and fitness
ECGNoNo
Blood oxygenYesNo
Skin temperatureNoNo
Sleep apnoea alertsNoNo
High blood pressure alertsNoNo
Body compositionNoNo
Fall detectionNoNo
Crash detectionNoNo
GPSSingle-bandSingle-band
Water resistance50 m50 m
SensorsGarmin Elevate wrist heart rate; Pulse Ox; barometric altimeter; compass; accelerometer; thermometer; ambient light sensor; GPS, GLONASS and GalileoGPS, GLONASS, Galileo, Garmin Elevate wrist heart rate and accelerometer.
Health featuresContinuous heart rate with high/low alerts; HRV status; Body Battery; stress, respiration and blood oxygen; advanced sleep and sleep score; sleep coach and nap detection; Health Snapshot; hydration and women's health tracking; no ECG appAll-day heart rate, stress and sleep tracking, plus Body Battery energy monitoring.
Fitness featuresDaily suggested running workouts and Garmin Coach plans; training effect and recovery time; wrist-based running dynamics and running power; PacePro; VO2 max and race predictions; pool and open-water swimming; running, cycling, strength, HIIT, yoga, Pilates, tennis, pickleball and padel profiles; point-to-point and breadcrumb course navigation, back-to-start and TracBack; no full offline maps or dedicated triathlon mode; no training readiness, load or status (Wareable and Tech Advisor)Garmin Coach, VO2 max estimate, running and cycling profiles, indoor track, treadmill, elliptical, cardio and yoga activities.
Safety featuresIncident detection during selected activities, assistance and LiveTrack require a paired compatible smartphone and connectivity; live event sharing is Android-onlyIncident detection, assistance and LiveTrack require a paired phone.
Battery and connections
Battery life (maker's claim)Up to 11 daysUp to 7 days
In low-power modeUp to 20 days–
Mobile data optionNoNo
Works withiPhone and AndroidiPhone and Android
Storage4 GB–
Battery life detailSmartwatch up to 11 days; battery saver smartwatch up to 20 days; GPS-only up to 19 hours; all-systems GNSS up to 17 hours; actual life depends on display settings, enabled features and useUp to seven days in smartwatch mode or 13 hours in GPS mode.
ChargingGarmin proprietary plug charging/data cable; rechargeable built-in batteryRechargeable battery with Garmin charging cable.
ConnectivityBluetooth and ANT+ ; controls smartphone music without offline playback; no Wi-Fi; Garmin Pay; Connect IQ apps, watch faces and data fields; smart notifications; Android-only text responses and notification images; Garmin Share and Garmin Messenger; no cellular connection or multi-band GNSSBluetooth and ANT+; smart notifications, phone music controls and Connect IQ watch faces. No on-watch music storage.
Storage4 GB memory/history ; standard model has no offline music player–
Design
Weight (lightest version)39 g36 g
SoftwareGarminGarmin
Case materialsFibre-reinforced polymer bezel; chemically strengthened glass; silicone band; 5 ATM water ratingSilicone band and 5 ATM water rating.
Size43 x 43 x 11.6 mm; Garmin lists 39 g without a separate body-only weight42 x 42 x 11.4 mm; 36 g.
Bands20 mm quick-release silicone bands; fits 126–203 mm wristsFits wrists 129–197 mm.
ColoursBlack/Slate Grey; Mist Grey/WhitestoneLava red band with black case.
In the boxForerunner 165; charging/data cable; documentation–

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