OnePlus 15 has the best battery performance ever recorded in tests.
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It features fast operation, IP68, IP69, and IP69K ratings, rapid charging and a wall adapter, a flat, bright OLED display, and a reasonable price that is lower than most Galaxies, iPhones, and Pixels in the US.
While it lacks some typical OnePlus features and design and also copies the iPhone in a generic manner, it is still a very capable phone that should be considered when looking for good value in 2025.
It is a great option if battery life is a priority.
Impressive Battery
Despite the other appealing features, the battery remains the most vital component of any modern smartphone and the most crucial hardware aspect in the long term.
Disassembling the OnePlus 15 reveals a 7,300 mAh battery occupying most of the rear internal space. This battery uses silicon-carbon technology instead of lithium-ion, exceeding expectations for phone battery capabilities.
In addition to the impressive battery, the Snapdragon 8 Elite Gen 5's efficiency contributes significantly to the phone's exceptional battery performance. OnePlus has finely tuned it for stability.
Although it may not achieve top scores in demanding 3D tests or reach high frame rates, it delivers a consistent gaming experience.
The Longest-Lasting Battery on a Phone We've Ever Tested
Having assessed the battery performance of hundreds of phones over the years using our standardized tests, the OnePlus 15 leads the rankings with the longest battery life.
The OnePlus 15 has an estimated battery life of 10 hours and 44 minutes, which is a combined score from three tests. It achieved over thirty hours in our web browsing test, 12 and a half hours in our video test, and over 14 hours in our 3D gaming test. These results place the OnePlus 15 at the top.
The ASUS RedMagic 11 Pro, which has a larger 7,500 mAh battery, follows closely behind but falls short by one minute in the overall battery life score. The ASUS Zenfone 10, Sony Xperia 10 IV, and Nubia Z800 Ultra are also among the top performers.
Battery Life
Charging
Phone Battery Life
estimate Browsing Video Gaming
OnePlus 15
7300 mAh
10h 44min 30h 6min 12h 37min 14h 16min
RedMagic 11 Pro
7500 mAh
10h 43min 25h 55min 15h 5min 14h 14min
Asus Zenfone 10
4300 mAh
10h 23min 27h 28min 14h 30min 10h 33min
Sony Xperia 10 IV
5000 mAh
10h 12min 21h 20min 17h 28min 10h 43min
nubia Z80 Ultra
7200 mAh
10h 7min 23h 10min 13h 25min 17h 23min
More details on battery and charging for all phones tested are available on our PhoneArena Battery Score page.
While it's true that the OnePlus 15 steps back from the original tenets that OnePlus stood by, it's challenging to find any true faults here when it delivers so well in a couple of very important aspects.
The excellent battery life makes this phone the one that power users should shortlist. The era of two-day phones is here, and it's only getting started! Who knows what 2026 could deliver, but one thing is for certain: the OnePlus 15's battery life record in our test might fall sooner rather than later.
How do other 2025 flagships compare to the OnePlus 15?
Battery Life
Charging
Phone Battery Life
estimate Browsing Video Gaming
OnePlus 15
7300 mAh
10h 44min 30h 6min 12h 37min 14h 16min
Samsung Galaxy S25 Ultra
5000 mAh
8h 0min 20h 49min 8h 54min 14h 21min
Apple iPhone 17 Pro Max
5088 mAh
7h 46min 20h 9min 9h 37min 11h 34min
Google Pixel 10 Pro XL
5200 mAh
6h 58min 19h 41min 10h 0min 4h 35min
Samsung Galaxy Z Fold 7
4400 mAh
5h 31min 14h 18min 6h 38min 8h 43min
OPPO Find X9 Pro
7500 mAh
9h 50min 25h 34min 13h 30min 11h 17min
vivo X300 Pro
6510 mAh
6h 30min 15h 51min 9h 30min 7h 36min
Xiaomi 15 Ultra
6000 mAh
7h 33min 16h 39min 10h 11min 13h 29min
More details on battery and charging for all phones tested are available on our PhoneArena Battery Score page.
The OnePlus 15 holds a significant advantage, nearly unchallenged at the top for battery performance.
Additionally, besides the Vivo, the OnePlus charges the fastest, reaching full capacity in just 45 minutes. A 30-minute charge provides almost 70% battery, which should be sufficient for a day and a half of moderate to high usage. This is very impressive.
Phone
Full Charging
30 min Charge
Wired
Wireless
Wired
Wireless
OnePlus 15
7300 mAh
0h 45min
1h 52min
68%
21%
Samsung Galaxy S25 Ultra
5000 mAh
1h 9min
1h 58min
68%
33%
Apple iPhone 17 Pro Max
5088 mAh
1h 16min
Untested
64%
Untested
Google Pixel 10 Pro XL
5200 mAh
1h 17min
Untested
63%
Untested
Samsung Galaxy Z Fold 7
4400 mAh
1h 23min
2h 18min
46%
26%
OPPO Find X9 Pro
7500 mAh
1h 20min
Untested
52%
Untested
vivo X300 Pro
6510 mAh
0h 31min
Untested
98%
Untested
Xiaomi 15 Ultra
6000 mAh
1h 3min
Untested
58%
Untested
More details on battery and charging for all phones tested are available on our PhoneArena Battery Score page.
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