OnePlus 15T vs Samsung Galaxy S24 Ultra

OnePlus 15T

The 6.32-inch 165 Hz 1.5K AMOLED panel is the only true 165 Hz compact-flagship display on the market and pairs that refresh rate with a measured 1,800 nits brightness, 460 ppi pixel density, Crystal Shield Glass, and HDR10+/Dolby Vision support. Native 165 Hz support in popular FPS games is a real differentiator. Notebookcheck flags 120.7 Hz PWM dimming that can cause eyestrain for sensitive users.

• The 6.32-inch 165 Hz AMOLED panel achieves a very good 460 ppi pixel density and the advertised maximum brightness of 1,800 nits in standard measurement.
• Display sharpness is plenty competent — sharp, smooth, and easily one of the strongest spec sheets you can get on a compact phone.
• Native 165 Hz support in COD, Delta Force and Peacekeeper Elite makes this the only small-screen flagship pushing a full 165 Hz gaming experience.
• OnePlus claims up to 3,600 nits peak brightness — even on a playground in direct sunlight you can still see everything clearly, no squinting required.
• Specifications confirm a 6.32-inch 1.5K (1216 × 2640) resolution with 165 Hz refresh — a configuration unique to the 15T in the compact class.
• Display backlight flickers at just 120.7 Hz under PWM dimming — low enough that the flickering may cause eyestrain and headaches for sensitive users after extended use.

Samsung Galaxy S24 Ultra

Universally praised. The 6.8-inch QHD+ LTPO AMOLED hits 2,600 nits peak with a new anti-reflective Gorilla Armor finish that makes it exceptional in bright sunlight.

• The display is so easy to use outside in bright light that the reviewer wants every other manufacturer to copy it.
• Peak brightness is rated 2,600 nits, up from 1,750 nits on the S23 Ultra — a big real-world jump for outdoor use.
• Measured brightness reached ~2,408 nits on a 20% white window versus ~2,235 nits on the iPhone 15 Pro — a measurable win.
• It is a Dynamic LTPO AMOLED 2X, 120Hz, HDR10+, 2,600 nits peak panel at QHD+ resolution.
• Two years later the 6.8-inch QHD+ AMOLED 'has aged like fine wine' with no screen burn-in and still buttery 120Hz.

OnePlus 15T

This is the section the OnePlus 15T was built to win. The 7,500 mAh silicon-carbon 'Glacier' cell is the largest ever fitted to a true compact phone — 50% bigger than the iPhone 17's pack in a similar footprint. Notebookcheck measured roughly 1.5 days of real-world endurance at 150 cd/m². Wired charging tops out at 100 W, wireless at 50 W. The only friction points are the missing built-in magnets for MagSafe-style alignment and the still-USB-2.0 port.

• OnePlus relies on a silicon-carbon-based battery with a large capacity of 7,500 mAh for its mini flagship — in our practical battery test at 150 cd/m² brightness, the 15T achieved an excellent battery life of nearly 1.5 days.
• 9to5Google's preview confirms the 7,500 mAh cell carries the same 'Glacier' moniker as the OnePlus 15's battery, so the silicon-carbon structure is here too — 200 mAh more than the larger sibling.
• Even though the phone keeps the same compact size, it now packs a massive 7,500 mAh battery — to put that into perspective, the iPhone 17 Pro Max only has around 5,000 mAh, and this is a 6.32-inch phone.
• Battery life is wild for a phone this size and is actually a hair bigger than the one in the OnePlus 15, which has a noticeably larger footprint.
• 100W SuperVOOC wired charging and 50W wireless mean even the huge cell refills fast — getting through two full days on a single charge feels totally realistic.
• There is no native magnetic Qi alignment — wireless charging works, but accessories require a separate magnetic case for MagSafe-style snap-on functionality.
• r/Android's reaction to the battery is unambiguous — 'Incredible battery life makes the compact smartphone competition pale in comparison' is the actual review-thread headline.

Samsung Galaxy S24 Ultra

5,000mAh with 45W wired and 15W wireless. All-day battery is consistent praise; charging speed versus Chinese rivals is the recurring criticism, and there is a noted One UI update battery-drain bug.

• In a head-to-head battery test it lasted 12h31m, over an hour longer than the iPhone 16 Pro Max's 11h22m.
• 5,000mAh battery with 45W wired (65% in 30 min), 15W wireless and 4.5W reverse wireless.
• Charging is on par with Apple and Google but 'leagues behind rivals out of China' that charge far faster.
• After two years, moderate use still delivers a full day with 25–30% left by bedtime; light use can stretch toward two days.
• Measured battery health was 93% after two years (one heavy year, one moderate), per Samsung's hidden diagnostics.