OnePlus 15T vs Samsung Galaxy Z Flip 6

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 Z Flip 6

A 4,000mAh battery (about 10% bigger than the Flip 5) with 25W wired and 15W wireless — better than past Flips but small and slow next to clamshell rivals.

• A roughly 10% larger battery plus the Snapdragon 8 Gen 3 yields about an hour more screen-on-time per day than the Flip 5.
• The 4,000mAh cell is modest — Oppo and Vivo clamshells are at 4,300–4,400mAh — though any increase is welcome.
• Charging is 25W wired and 15W wireless — slow versus the fast-charging competition.
• Owners feel confident leaving the house at ~50% and getting home with good battery, but the always-on cover screen can quietly eat charge.
• A battery-care option lets you cap charging at 85% to preserve long-term battery health.

OnePlus 15T

The OnePlus 15T ships with ColorOS 16 on Android 16 in China rather than the global OxygenOS, though the two skins are now nearly identical in feel. Update commitments are unclear — OnePlus doesn't publish a timeline for Chinese-market hardware, and even the global OnePlus 15 only commits to 4 years of major Android upgrades. Mind Space (AI-powered productivity vault) and Gemini integration are the headline software features.

• ColorOS 16 comes pre-installed on the 15T instead of OxygenOS — but the differences are minor overall, with German language and Android Auto supported, though no WearOS watches or eSIMs.
• There are question marks over the duration of the updates provided — the manufacturer does not usually provide any information on this for China, though typically a OnePlus 15-class phone should receive security updates for six years.
• OxygenOS 16 (and ColorOS 16 by extension) integrates Gemini with Mind Space — you can ask Gemini about any saved memory and it accesses local content to perform tasks, making it the best on-phone AI integration we have seen.
• Mind Space is the headline AI feature — a digital vault that takes a screenshot of important content and saves it as a card with URL, summary, title and hashtags for contextual search.
• The system feels incredibly smooth — arguably one of the best experiences you can get on Android right now, with useful features for students like meeting summaries and lecture transcription.
• Update commitment trails the competition — even on the global OnePlus 15 the company only promises 4 years of major Android upgrades, well behind Samsung and Google's 7-year commitments.

Samsung Galaxy Z Flip 6

Galaxy AI plus seven years of updates. The longevity is excellent; the cover-screen software remains the line's frustration.

• Long update support — seven years of OS and security updates — is a listed strength.
• After a year there's been no performance degradation and seven years of updates means it will last a long time.
• One UI 7 brings major improvements to the Flip 6, including updated drawing/photo assist and generative edit.
• The AI transcription feature worked well with only a couple of typos.
• Doing most tasks (email, WhatsApp, Samsung Pay, notifications) on the outer display reduces the temptation to open it and doomscroll.