Redmi K90 Max Goes All-In on Power – Massive Battery and Fan Cooling Revealed

Luiza Mosneagu
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Luiza Mosneagu
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Reviews Editor · Droid Tools
Luiza leads hands-on reviews at Droid Tools, having tested over 60 Android smartphones and wearables since 2020. She approaches every device the same way: daily use...
- Reviews Editor · Droid Tools
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Redmi has launched the K90 Max in China, adding it to the growing K90 lineup alongside the Redmi K90 and K90 Pro Max. The new phone brings a 6.83-inch display with a 165Hz refresh rate, an 8,550mAh battery with 100W wired fast charging, and a MediaTek Dimensity 9500 SoC with up to 16GB of RAM. Other highlights include a Bose-tuned speaker system and a dual rear camera setup led by a 50-megapixel primary sensor.

Redmi K90 Max color variants

Redmi K90 Max Price and Availability

The Redmi K90 Max starts at CNY 2,999 for the 12GB RAM + 256GB storage configuration. Both the 12GB + 512GB and 16GB + 256GB variants are priced at CNY 3,499. Moving up, the 16GB + 512GB model costs CNY 3,999, while the top-tier 16GB + 1TB variant is priced at CNY 4,699. The phone comes in three colour options: Space Silver, Shadow Black, and Sky Blue (translated from Chinese).

Redmi K90 Max Specifications and Features

The dual-SIM Redmi K90 Max runs Android 16-based HyperOS 3. Its 6.83-inch 1.5K (1,280 x 2,772 pixels) M10 display supports up to 165Hz refresh rate, a 480Hz touch sampling rate, 3,500Hz instantaneous touch sampling, 480Hz multi-finger touch sampling, and peaks at 3,500 nits brightness. The panel also carries HDR10+ and Dolby Vision certification.

Under the hood sits a MediaTek Dimensity 9500 chipset, paired with up to 16GB of LPDDR5x RAM and up to 1TB of UFS 4 storage. A dedicated D2 display chip handles gaming-focused processing. Thermal management is taken seriously here — the phone features a 6,000 sq mm ice-sealed circulating cooling pump and over 12,000 sq mm of graphite coverage, plus an active cooling fan that Redmi claims can bring temperatures down by around 10°C in just 100 seconds.

Xiaomi Redmi K90 Max

The rear camera system consists of two sensors: a 50-megapixel main camera with OIS and an f/1.68 aperture, backed by an 8-megapixel secondary shooter. On the front, a 20-megapixel camera covers selfies and video calls. Audio is handled by a 1115x symmetrical stereo dual-speaker setup, co-tuned with Bose.

Connectivity is comprehensive, covering 5G, Wi-Fi 7, Bluetooth 4, NavIC, GPS/AGPS, Galileo, GLONASS, BeiDou, NFC, OTG, and USB Type-C. The phone carries IP66, IP68, and IP69 ratings for dust and water resistance. Security is managed by a 3D ultrasonic in-display fingerprint sensor, and the onboard sensor array includes an accelerometer, ambient colour temperature sensor, electronic compass, gyroscope, IR remote control, flicker sensor, and an X-axis linear motor.

Powering everything is the 8,550mAh battery, which supports 100W wired fast charging and 22.5W reverse wired charging for topping up other devices on the go.

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Luiza leads hands-on reviews at Droid Tools, having tested over 60 Android smartphones and wearables since 2020. She approaches every device the same way: daily use across at least two weeks before writing a single word of the review. Battery numbers, camera comparisons, and benchmark scores are run in-house on every device she covers. Luiza is particularly focused on camera testing and everyday usability. She is based in Romania, which shapes her real-world testing conditions.
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