Review copy.  Used for 1 week only.

The TicWatch Pro 3 Ultra has an extremely long battery life.  I usually get 3+ days of regular use.  But your actual use may vary, depending on apps installed and watch face used.

About this item (from Amazon UK)
[Works with Vodafone OneNumber] Connect your TicWatch Pro 3 Ultra with your Vodafone account to share minutes and data for calls, notifications, music streaming and access to your favorite apps Connect to the Vodafone OneNumber website
[Long battery life] The dual-layer display 2.0 technology keeps the Ticwatch Pro 3 Ultra GPS smartwatch up to 72 hours in smart mode and 45 days in essential mode The new adjustable backlight gives you a better visual experience and makes the screen easy to read in all conditions, especially in the dark.
【Updated chipset, better experience】 Ticwatch Pro 3 Ultra 4G/LTE with Wear OS from Google and the Qualcomm Snapdragon Wear 4100 platform and Mobvoi dual processor system. Deliver faster and smoother performance and connectivity. 1G RAM and 8G ROM storage. Thanks to NFC functionality, Google Pay is a quick and easy way to pay in stores.
[Advanced Health and Fitness Monitoring] TicWatch Pro 3 Ultra GPS tracks your fitness and health data in real time. IP68 waterproof and suitable for pool swimming, improved 20+ professional sports modes, with built-in GPS and compass, speaker and microphone, barometer and sleep tracking, blood oxygen saturation, stress monitoring, and 24-hour heart rate monitoring (supported by a more accurate sensor)
[New detection and fatigue assessment] Record and label every heartbeat, monitor your heart rhythm, and warn of irregular heartbeats that may indicate atrial fibrillation (AFib). Assess mental fatigue and track your daily energy levels. Note: This feature is not intended to diagnose or treat medical conditions or for other medical purposes.
[Improved premium design, flagship model] Stylish and functional design with knurled stainless steel bezel, 1.4 inch AMOLED screen (454 * 454 high resolution) with automatically adjustable brightness, Corning Gorilla anti-fingerprint cover glass. Dual display with individual color backlight US military standard 810G certified durability. You can adjust the information displayed on the dials, such as weather/heart rate/steps.

TicWatch Pro 3 Ultra GPS SPECS
Model: TicWatch Pro 3 Ultra GPS LTE
Dimensions (mm): 47 x 48 x 12.3
Weight: 41g
Color: Shadow Black
Watch case: Stainless steel and high-strength nylon with fiberglass
Screen: Corning Gorilla Anti-fingerprint Cover Glass
Watch strap: Leather / Rubber 22mm
Operating System: Wear OS by Google
Chipset: Qualcomm® Snapdragon Wear™ 4100 Platform and Mobvoi dual processor system
Memory: RAM: 1GB / ROM: 8GB
Display: 1.4“ 454*454 326ppi Full Color Always On Display AMOLED + FSTN
Connectivity: Bluetooth 5.0, Wi-Fi:802.11b/g/n, 4G/LTE
GNSS: GPS+Beidou+Glonass+Galileo+QZSS
NFC Payments: Google Pay
Speaker: Yes
Mic: Yes
Vibrator: Yes
PPG: Yes
Barometer: Yes
Sensors: Accelerometer, Gyro Sensor, HD PPG Heart Rate Sensor, SpO2 Sensor, Low Latency Off-Body Sensor, Barometer
Battery capacity: 577mAh
Durability: IP68, Pool Swim/MIL-STD-810G4