The smartphone world is used to incremental updates, but the latest leaks surrounding the Redmi K90 Ultra suggest Xiaomi is preparing something far more experimental. Positioning itself as a dedicated performance flagship, the K90 Ultra appears ready to trade standard “all-rounder” specs for hardware usually reserved for professional gaming rigs.
Here is everything we know about the leaked specifications and features.
A First for Xiaomi: Active Cooling
The headline feature of the Redmi K90 Ultra is the reported inclusion of a built-in physical cooling fan. While brands like RedMagic have used this for years, it would be a first for a Xiaomi-group device.
The move is likely a strategic pivot. Since MediaTek reportedly isn’t releasing a “Plus” version of the Dimensity 9500 this year, Redmi is choosing to maximize the standard Dimensity 9500 chipset through superior thermal management. This active cooling, combined with a “high-frame-rate software layer,” aims to eliminate thermal throttling during marathon gaming sessions.
The “Battery Monster” Reputation
Early rumors suggested a mind-boggling 10,000mAh battery, but recent reports from reliable tipsters like Digital Chat Station have settled on a more realistic (but still massive) 8,500mAh capacity.
- Design Feat: Despite the huge cell and internal fan, the body is tipped to remain under 8.5mm thick, prioritizing “in-hand feel” alongside endurance.
- Charging: The device will support 100W wired fast charging and is expected to offer high-speed wireless charging—a necessity for a battery of this size.
Display Built for Speed
Redmi is moving beyond the standard 120Hz flagship fare. The K90 Ultra is expected to sport a 6.8-inch to 6.89-inch LTPS OLED flat display with:
- 165Hz Refresh Rate: Bringing gaming-monitor levels of smoothness to a mobile device.
- 1.5K Resolution: Balancing visual clarity with battery efficiency.
- Durability: A premium metal frame, ultrasonic in-display fingerprint scanner, and—remarkably—IP68 water resistance despite the internal fan.
Specs Snapshot: K90 Ultra vs. K90 Pro Max
| Feature | Redmi K90 Pro Max | Redmi K90 Ultra (Leaked) |
| Processor | Snapdragon 8 Elite Gen 5 | MediaTek Dimensity 9500 |
| Cooling | Passive Vapor Chamber | Internal Active Fan |
| Refresh Rate | 120Hz | 165Hz |
| Battery | 7,560mAh | 8,500mAh+ |
| Build | Glass/Leather | Metal Frame / 8.5mm Slim |
Launch Expectations
While the Redmi K90 and K90 Pro Max are already making waves, the Redmi K90 Ultra is expected to debut in China around May or June 2026. Global fans should keep an eye on POCO, as this hardware often makes its international appearance rebranded under the POCO F-series (likely the POCO F8 Ultra).