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| The existing Redmi K80 Ultra has a relatively simple design. |
The rumor mill is churning out exciting details about the long-anticipated Redmi K90 Ultra, also referred to as the Redmi K90 Extreme Edition. Set to complete the K90 series lineup, this phone appears poised to be a significant departure from its predecessors, the K90 and K90 Pro Max, with major upgrades in performance and battery life.
According to prolific and often reliable tipster Digital Chat Station, the device is in development with a "sub-series Dimensity 9500 performance model." This phrasing strongly suggests the phone will be powered by MediaTek’s yet-unreleased flagship-plus chip, the Dimensity 9500+, rather than the standard or "s" variant. This chipset is expected to push the boundaries of Android performance, potentially positioning the K90 Ultra as a true performance beast.
But the headline-grabbing leak is about endurance. Digital Chat Station alleges the phone will pack a colossal battery with a capacity roughly 15% larger than the previous generation. Early estimates point to a cell in the neighborhood of 8,500 mAh, a staggering size for a modern smartphone. This massive battery will reportedly support 100W wired charging, ensuring that topping up this powerhouse won't be a lengthy ordeal.
Adding to the performance-centric design, new evidence hints at an integrated cooling fan—a feature absent in earlier K90 models. This aligns with the device's "Extreme Edition" moniker, suggesting Xiaomi is targeting sustained peak performance for demanding tasks like high-fidelity gaming, which would be further enhanced by the expected high-refresh-rate display.
You can find Digital Chat Station's initial leak on Weibo here, where the details about the Dimensity model and battery were first discussed.
As for availability, history suggests the Redmi K90 Ultra will launch first—and possibly exclusively—in China. However, its specs make it a prime candidate for a global rebrand. It is widely expected to be released internationally as the successor to last year's well-received Xiaomi 15T Pro. For context, the current global model, the Xiaomi 15T Pro, remains a strong contender in the value flagship segment.
Another source, PaperKing13 on X (formerly Twitter), has corroborated aspects of the launch strategy and performance tuning, adding credibility to the emerging picture.
Pricing remains under wraps, but if it follows the K series tradition, it will aim to deliver flagship-level specs at an aggressive price point. For those looking for a current-generation alternative while waiting for the K90 Ultra, the Xiaomi 15T Pro is available on Amazon.
The Bottom Line
If the rumors hold true, the Redmi K90 Ultra is shaping up to be a monster of a phone, built for users who prioritize raw power and unparalleled battery life above all else. The combination of a potential Dimensity 9500+ chipset, an 8,500 mAh battery with 100W charging, and active cooling could make it a unique and highly competitive device in the crowded smartphone market. An official debut date is still unknown, but the volume of leaks indicates an announcement could be on the horizon.
Sources: Digital Chat Station on Weibo & PaperKing13 on X.
Redmi K90 Ultra (prague) might have a built-in cooling fan
— PaperKing13 (@paperking13) February 2, 2026
Xiaomi has been adding some fan code recently with fancy game and charging modes, let's see what they will cook 🙂↔️ pic.twitter.com/TtJLk2KJkG