Samsung Galaxy Watch Ultra2

What’s new over the first Galaxy Watch Ultra

Ultra2 comes in one 47mm titanium size and puts a much bigger battery inside a thinner case. Samsung says the 800mAh battery is 35% larger than the first Ultra’s, and the case is 12% thinner at 10.7mm. The screen claim jumps to 5,000 nits, and Ultra2 is, by Samsung’s account, the first Galaxy Watch with Fast Charging.

Two features are Ultra2-only: Trail Run mode in Samsung Health, and the Mares Ultra2 Diving app, which is coming later and stays exclusive to Ultra2 on Wear OS for two years.

Battery and charging

Mode	Galaxy Watch Ultra2
Battery capacity	800mAh
Always-on display	Up to 60 hours
GPS tracking	Up to 20 hours
GPX route following	Up to 16 hours
Low-power mode	Not published
Fast Charging	40% in about 30 minutes; full in about 90

Sixty hours with the always-on display is about two and a half days, so a weekend away without the charger is realistic. With GPS tracking running, the 20-hour rating covers a long day on the trail, not a multi-day trek. Charging is wireless, on the WPC standard.

Water, dives and trails

This is where Ultra2 earns its price over Watch9. It’s rated 10 ATM (100m under ISO 22810), IP69K, and tested to MIL-STD-810H for heat and cold, altitude, humidity, immersion, salt fog, dust, vibration and drops. It’s certified to EN13319, and with Auto launch on dive turned on it logs depth, dive time and water temperature. Samsung’s internal testing puts its on-wrist operating range at −20°C to 55°C, though charging and some features may be limited at the extremes.

On land, Trail Run tracks elevation, climbing progress and terrain impact, and its Nutrition Alert gives hydration guidance based on sweat loss. You can import GPX files into Samsung Health for turn-by-turn hiking and cycling routes, with Climb Guidance on the way up. Running Coach builds a 3–5 week plan around your ability, and on the bike Ultra2 connects straight to cadence, power and speed sensors without your phone in between.

Screen

The 1.52-inch Super AMOLED is 498 × 498 pixels under sapphire, with a full-color always-on mode. Samsung’s 5,000 nits is a localized peak measured in bright surroundings, which it calls a first for a smartwatch based on a June 2026 survey; it says full-screen brightness may differ.

Health and Samsung Health scores

The BioActive Sensor combines optical heart rate, an electrical heart signal and BIA body composition, alongside a temperature sensor. The electrical sensor is there, but Samsung doesn’t spell out ECG app availability for Ultra2.

Samsung Health turns those readings into scores. Energy Score rates your day each morning from yesterday’s activity, your sleep and overnight heart signals. Heart Health Score, which needs 24 hours of wear to start, looks at sleep time, BMI and vigorous activity. Daily Cardio Load tracks training volume once it has 7 days of data (28 is better), and Fitness Index combines BIA, VO2 max and your activity history. Vitals and hearing features are here too.

Sleep Coaching assigns you one of eight animal-themed sleep types after a week of wear and then runs a 3–4 week program, with bedtime guidance along the way. Sleep apnea risk detection, which Samsung says is FDA-cleared for moderate to severe risk, needs two nights of data within 10 days and isn’t for anyone already diagnosed or pregnant.

Software, safety and payments

Ultra2 runs Wear OS 7 with One UI 9 Watch on the Snapdragon Wear Elite, with 2GB of RAM and 64GB of storage. It has Bluetooth 6.0, dual-band Wi-Fi and NFC for Samsung Wallet, and the LTE model needs a carrier plan.

For safety it has fall detection and a siren, though calling emergency contacts needs a network connection. Samsung doesn’t advertise a Loss of Pulse feature like Pixel Watch 5’s.

Ultra2, Watch9 or Apple Watch Ultra 4?

Spec	Galaxy Watch Ultra2	Galaxy Watch9	Apple Watch Ultra 4
Case	47mm titanium, 61.5 g	40mm or 44mm aluminum	49mm Grade 5 titanium, about 63 g
Peak brightness	5,000 nits (localized peak)	3,000 nits	3,000 nits
Battery	800mAh; up to 60 hours, always-on display	390–445mAh	Up to 50 hours; 84 in Low Power Mode; 45 in Max Extended Workout
Software	Wear OS 7	Wear OS 7	watchOS 27
Works with	Android 13 or newer	Android 13 or newer	iPhone 11 or later
Water and diving	10 ATM; EN13319; automatic dive tracking	5 ATM; IP68; no EN13319	EN13319 dives to 40m; Oceanic+
Satellite	Not listed	Not listed	SOS, Messages and Find My
US price	$699.99	See the Watch9 guide	$799 at launch

Watch9 shares the chip and the software in a smaller aluminum case, but it’s a 5 ATM swim watch with about half the battery and no dive certification. Apple Watch Ultra 4 has satellite SOS, Messages and Find My and launched at $799, but it only works with an iPhone. Apple Watch Ultra 4 vs Galaxy Watch Ultra2 and Pixel Watch 5 vs Galaxy Watch Ultra2 go further.

Price

Galaxy Watch Ultra2 lists at $699.99 at samsung.com in the US and £649 in the UK. Samsung Credit and trade-in offers can lower what you pay, and Samsung has bundled a 60-day Strava trial and 2 months of iFIT, but none of that changes the list price. Prices move, so check before you buy.