What happens when you pack a huge 7,500mAh battery into a compact 6.32-inch flat display? In this video I’m testing the brand new OnePlus 15T properly—real gaming, real daily use, and the stuff that actually matters if you’re buying in the UK. I also quickly compare it to the older OnePlus 13T, because that phone had amazing endurance and performance, but it felt a bit one-dimensional with missing flagship features. After using the 15T, I can honestly sum it up in two words: seriously impressive. I go deep on the upgrades: Snapdragon 8 Elite Gen 5 performance, the 165Hz ultra-high refresh rate with insanely thin bezels, and the new “complete flagship” feel—100W wired + 50W wireless charging, 3D ultrasonic fingerprint, and proper IP ratings. I ran long gaming sessions (Genshin Impact, Peacekeeper Elite, Star Iron) and focused on stability, heat control, and responsiveness. Then I pushed the Glacier Battery across two full days with different “user roles,” and it genuinely made me stop thinking about battery percentage. I also cover the 3.5x periscope camera upgrade and why it’s solid for everyday shots, even if it’s not the absolute best camera flagship.