Redmi K90 Max Launches April 21 — Biggest Fan in a Smartphone, 8,550mAh Battery
RedmiMonday, 20 April 2026 at 09:51
Redmi confirmed the K90 Max for April 21. The Sky Blue color is out and it's striking, but the real story is what's inside. This phone has the largest active cooling fan ever fitted to a smartphone. That fan drops internal temperature by 10°C in 100 seconds. It still has IP66/68/69 water resistance despite it.
That combination of engineering challenges solved in one device is the headline.
Key Points
- Redmi K90 Max launches April 21 in China — confirmed colors are Space Silver and Sky Blue, a low-saturation metallic finish
- Powered by Dimensity 9500 paired with a dedicated D2 graphics chip that enables 165fps frame interpolation in games natively capped below that
- 8,550mAh silicon-carbon battery with 16% silicon content, 100W wired charging, and 22.5W reverse wired charging
- Largest active cooling fan ever placed inside a smartphone — reduces internal temperature by 10°C in 100 seconds, with IP66/68/69 water resistance maintained
- 6.83-inch 1.5K OLED at 165Hz, 3,500 nits peak brightness, 480Hz touch sampling, LPDDR5X RAM, and UFS 4.1 storage
The Fan Changes What's Possible
Most gaming phones manage heat through vapor chambers and graphite layers. Active fan cooling is rare outside dedicated gaming phones like RedMagic — and fitting one into a mainstream flagship while keeping IP69 dust and water resistance is a genuine engineering achievement.
The K90 Max's fan uses an independent sealed air duct and full-metal bearing construction. The 10°C temperature drop in 100 seconds isn't a theoretical benchmark — it's the practical difference between a phone that thermal throttles after 20 minutes and one that holds peak performance through a long session.
D2 Does the Heavy Lifting on Frame Rate
The Dimensity 9500 handles general compute. The dedicated D2 graphics chip takes on frame interpolation and resolution scaling — pushing games to 165fps even when they don't natively support it. Combined with the 165Hz panel's 480Hz touch sampling and 3,500Hz instantaneous sampling rate, the K90 Max is built for competitive gaming in a way that spec sheets alone don't fully capture.
Battery That Redefines Endurance for a Gaming Phone
Eight thousand five hundred and fifty milliamp hours is exceptional in any context. In a gaming phone, where sustained GPU and CPU loads drain cells fast, it's transformative. The 16% silicon content in the silicon-carbon battery design is what keeps the cell this large without adding the weight that traditional battery chemistry demands.
A hundred watts wired charging means that 8,550mAh doesn't feel like a liability — a full charge is still fast. Bypass charging is also supported, running the phone directly from the charger during gaming to protect battery health over time.
The K90 Max is expected to reach global markets as the Xiaomi 17T.
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