Redmi K90 Ultra Specs Confirmed: 165Hz, 8550mAh, Built-In Fan

Redmi has confirmed the final display, battery and charging specifications of the K90 Ultra ahead of its June 30 launch in China. The phone pairs a 165Hz refresh rate on a 6.83-inch flat OLED panel with an 8,550mAh Xiaomi Jinshajiang battery and 100W wired charging, all wrapped in a frame that still carries an active cooling fan and IP68 and IP69 dust and water resistance.

Per the full spec confirmation for the K90 Ultra, Redmi is positioning the handset in the 3,000 Yuan (~$440) segment, well below flagship gaming phones from Asus ROG, Red Magic and Lenovo Legion that occupy the 5,000 Yuan tier and above. At 3,000 Yuan, a Snapdragon 8 Elite chipset, a dedicated D2 display chip, and an integrated cooling fan is a combination that changes what the segment expects from a mid-range gaming phone.

The Final Spec Sheet Before Launch Day

Redmi has been drip-feeding K90 Ultra details since pre-orders opened earlier this month. The company’s Weibo post pins the China launch to June 30 at 7pm local time, and the launch date and 3,000 Yuan pricing reveal set the frame the rest of the spec sheet gets read through.

The phone sits below the Redmi K90 Max in the lineup. Xiaomi Group President Lu Weibing told GSMArena the K90 Ultra carries a price tag of around CNY 3,000, the same band Redmi itself used in its launch teaser. That pricing is the load-bearing number here.

The confirmed feature set runs longer than most phones at this price.

• 6.83-inch flat OLED display, 165Hz refresh rate, 3,500-nit peak brightness, M10 material, Xiaomi Qingshan eye protection
• Snapdragon 8 Elite chipset paired with a dedicated D2 gaming display chip
• 8,550mAh Xiaomi Jinshajiang battery with 16 percent silicon content
• 100W wired charging, 22.5W wired reverse charging, motherboard bypass charging for in-game sessions
• 18.1mm active cooling fan with metal bearings, ~32dB noise floor, 10°C drop in 100 seconds (per Redmi)
• IP68 and IP69 dust and water resistance
• Space Silver variant with aluminium CNC frame and anodised finish
• Stereo speakers, X-axis linear motor

What changes from the K90 Max is the silicon. The Snapdragon 8 Elite replaces the Dimensity 9500 that powered the Max, and a dedicated D2 chip handles display duties alongside it.

The Display and Why 165fps Matters

Redmi confirmed the K90 Ultra will ship with a 6.83-inch flat OLED panel with slim bezels and large rounded corners. The display runs at a 165Hz refresh rate, uses M10 display material, and reaches a 3,500-nit peak brightness. The panel also carries Xiaomi’s Qingshan eye protection technology and gaming touch enhancements.

The under-the-hood part is the optimised game list. Per the spec confirmation, more than 40 games are already tuned to run at a native 165fps on the device, with the brand publishing specific titles as part of its teaser campaign. A 165Hz panel without developer support is just a marketing number, since the panel will default to lower refresh rates in apps that do not call for higher. A published roster of titles running at full refresh is what makes the K90 Ultra’s display distinct from the same 165Hz claim on cheaper panels, and whether the 40-game figure holds up on day-one reviews is the first thing reviewers will check.

Battery, Bypass Charge, and a Built-In Fan

The battery cell is a Xiaomi Jinshajiang unit with 16 percent silicon content and a capacity of 8,550mAh. Wired charging tops out at 100W, with 22.5W wired reverse charging and motherboard bypass charging to keep heat off the SoC during long gaming sessions. Gizmochina also confirms landscape network optimisation and dedicated gaming audio features alongside the power system.

The 16 percent silicon content is what lets Xiaomi push this capacity into a chassis still slim enough to hold IP68 and IP69 ratings. Standard lithium-ion cells cannot match the energy density without inflating thickness, and bypass charging during gameplay is the practical answer to the heat high-wattage top-ups would otherwise dump into the silicon. The same design logic now runs across Redmi’s broader roadmap, with the Redmi Note 17 line reportedly targeting 9,000mAh and above, per earlier Redmi Note 17 battery coverage.

The cooling setup is the spec the rest of the industry cannot match at 3,000 Yuan. The K90 Ultra carries over the active cooling system from the K90 Max, including an 18.1mm cooling fan with metal bearings. Redmi claims the solution can reduce temperatures by up to 10 degrees Celsius within 100 seconds while keeping fan noise at around 32dB. The air outlet sits beneath the rear camera module, with the fan integrated into the phone’s structure without affecting battery capacity or durability.

Paired with the Snapdragon 8 Elite and the D2 chip, the fan is what the rest of the spec sheet depends on. Per the launch-date report, Redmi claims the K90 Ultra can maintain a stable frame rate for up to 60 minutes in a graphically intensive 3D turn-based mobile game running at the highest visual settings without frequency throttling. The 60-minute claim is the number the gaming-phone segment will be measured against, and the first figure reviewers will test when units arrive.

Why 3,000 Yuan Is the Whole Story

Asus ROG, Red Magic, and Lenovo Legion handsets sit in higher tiers, and the K90 Ultra lands at a price point they do not currently contest. The spec sheet does not read like the trim job that gap usually implies. The Snapdragon 8 Elite is the same silicon those phones run, the 165Hz panel matches their refresh targets, and the active fan has been a Redmi Max exclusive until now.

This is the second 165Hz gaming phone Redmi has shipped in 2026. The K90 Max arrived in April with a Dimensity 9500 and the same cooling architecture. The Ultra swaps MediaTek silicon for Qualcomm, adds the D2 display chip, and lands in a price tier where Xiaomi’s mid-range Note line is also pushing battery capacity past 9,000mAh. The playbook is consistent across the lineup. Top-tier silicon where it can fit, a thermal solution tuned for sustained load, and pricing that puts the result one tier below where the dedicated gaming flagships live.

The IP68 and IP69 rating is also unusual for a gaming phone at this price, since most mid-range handsets ship with IP54 splash resistance. Even OPPO’s A6 Pro 5G and its full IP66/IP68/IP69 stack was a standout at its price point when it launched, and that handset is not designed for sustained gaming workloads. Redmi is now putting the same triple waterproofing on a phone with a built-in cooling fan.

What Redmi Hasn’t Confirmed Yet

The camera configuration is the largest gap on the spec sheet. The launch coverage confirms the rear module design and a horizontal dual-camera layout carried over from the K90 Max, but sensor sizes, megapixel counts, and any telephoto or ultrawide details are not yet on the official list. Ultrasonic in-display fingerprint authentication is also still in the rumour column, per Gadgets360’s roundup of earlier leaks. Software is similarly unspecified beyond the standard Xiaomi HyperOS layer, and any AI camera features the brand may have planned have not surfaced in the Weibo teasers.

Global launch plans are also absent. Pre-orders and the June 30 event are confirmed for China only, and the rest of the K90 lineup has historically reached India months later. Redmi has not named a date, a starting price, or which markets are first in line outside the mainland.

Frequently Asked Questions

When does the Redmi K90 Ultra launch?

Redmi has confirmed a June 30, 2026 launch in China at 7pm local time, with pre-orders already open through official channels. Global release plans have not been announced.

How much will the Redmi K90 Ultra cost?

Xiaomi Group President Lu Weibing told GSMArena the handset carries a price tag of around CNY 3,000. Gizmochina describes the phone as a performance-focused gaming flagship in that same band (~$440).

What chipset does the Redmi K90 Ultra use?

Qualcomm’s Snapdragon 8 Elite paired with a dedicated D2 gaming display chip that handles display processing alongside the main SoC.

How big is the Redmi K90 Ultra battery?

An 8,550mAh Xiaomi Jinshajiang cell with 16 percent silicon content, supporting 100W wired charging. Bypass charging routes power around the battery during gameplay to limit heat.

Does the Redmi K90 Ultra have a cooling fan?

Yes. The phone uses the active cooling system from the Redmi K90 Max, including an 18.1mm fan with metal bearings. Redmi says the fan cuts temperatures by up to 10 degrees Celsius within 100 seconds and runs at around 32dB.

Is the Redmi K90 Ultra water resistant?

Yes. The handset is rated IP68 and IP69 for dust and water resistance, which covers submersion and high-pressure hot water jets at the IP69 tier.