Battery life claims on spec sheets are marketing copy — real answers come from lab tests that run phones through identical workloads until they die. Here's what the major testing outlets are actually finding in 2026, and the picture is dominated by one brand nobody expected a few years ago: OnePlus.
Tom's Guide: the current champion
Tom's Guide runs a continuous web-browsing battery test at fixed brightness, and its 2026 rankings crown the OnePlus 15 as the outright leader, lasting 25 hours and 13 minutes on a single charge — the first phone in its testing history to comfortably clear a full two-day runtime (Tom's Guide). The rest of the top 10 tells its own story about who's actually winning the endurance race:
| Rank | Phone | Battery test time |
|---|
| 1 | OnePlus 15 | 25:13 |
| 2 | OnePlus 15R | 21:54 |
| 3 | Asus ROG Phone 9 Pro | 20:34 |
| 4 | OnePlus 13 | 19:45 |
| 5 | Moto G (2026) | 19:10 |
| 6 | Moto G Play (2026) | 18:50 |
| 7 | OnePlus 13R | 18:49 |
| 8 | Moto G (2025) | 18:32 |
| 9 | Moto G Power (2026) | 18:22 |
| 10 | iPhone 17 Pro Max | 17:54 |
Source: Tom's Guide. Notice what's missing from the top 10 entirely: Samsung's Galaxy S-series doesn't show up until 12th place with the Galaxy S25 Ultra at 17:14 (Tom's Guide).
CNET: Apple and OnePlus lead the field
After testing 35 phones through its own lab process, CNET reached a similar conclusion, naming Apple and OnePlus as the two brands consistently topping its battery rankings, with the iPhone 17 Pro Max singled out as the single best performer it tested (CNET). That's a notably different verdict from Tom's Guide's browsing test, which puts the same iPhone at 10th — a reminder that test methodology (web browsing vs. mixed-use benchmarks) changes the ranking significantly.
Tech Advisor: PCMark stress-test results
Tech Advisor uses the PCMark battery benchmark, a heavier synthetic stress test, and crowned the Oppo Find X9 Pro its best overall pick after it ran for 26 hours and 40 minutes — powered by a 7,300mAh silicon-carbon cell, a battery chemistry that packs more capacity into the same physical size than standard lithium-ion cells (Tech Advisor). The Xiaomi 17 Ultra also stood out with a 6,000mAh battery lasting 21 hours and 27 minutes in the same test (Tech Advisor).
PhoneArena: budget and mid-range picks
Not everyone needs a flagship to get great battery life. PhoneArena's independent testing found the Motorola Moto G (2025) leading the affordable segment with 8 hours and 15 minutes of active use and over 22 hours of continuous web browsing, edging out the Google Pixel 9a (8:11 overall, but ahead in gaming battery life at over 12 hours) and the Nothing CMF Phone 2 Pro in third at 7:55 (PhoneArena).
Android Authority: real-world testing pick
Android Authority's hands-on, full-day usage testing also lands on the OnePlus 15 as the best overall phone for battery life, reinforcing that the silicon-carbon battery cells OnePlus has adopted are delivering a genuine, not just marketed, endurance advantage over rivals (Android Authority).
Why OnePlus is suddenly winning
The common thread across nearly every outlet is battery chemistry, not just capacity. OnePlus and Oppo (its sibling brand) have moved to silicon-carbon battery cells, which pack roughly 10% more energy into the same physical volume compared to conventional lithium-ion batteries — letting phones like the OnePlus 15 and Oppo Find X9 Pro fit 7,300–7,400mAh batteries into normal flagship-sized bodies without becoming bulky (Tom's Guide; Tech Advisor).
Which test should you trust?
| Outlet | Test method | Top pick | Result |
|---|
| Tom's Guide | Continuous web browsing | OnePlus 15 | 25:13 |
| CNET | Mixed lab testing, 35 phones | iPhone 17 Pro Max | Top performer, brand-level win for Apple/OnePlus |
| Tech Advisor | PCMark stress test | Oppo Find X9 Pro | 26:40 |
| PhoneArena | Real-world use, budget segment | Moto G (2025) | 8:15 active use |
| Android Authority | Full-day real-world use | OnePlus 15 | Best overall |
If you want the single most battery-confident flagship right now, the OnePlus 15 has the strongest cross-outlet support — it wins Tom's Guide's browsing test and Android Authority's real-world pick, and its silicon-carbon sibling (the Oppo Find X9 Pro) tops the heaviest stress test at Tech Advisor. If you're an iPhone user, the 17 Pro Max remains the clear Apple standout, even if it now trails the best Android flagships by several hours in most tests.