Emir BardakçıBlogger @DigitalChatStation reported via Weibo that a future smartphone from a major manufacturer is readying a major battery bump, going up to 10,000mAh while maintaining less than 8.5mm of thickness for the device. Industry observers believe this device is widely believed to be the REDMI K90 Ultra, Xiaomi’s next-generation performance-focused flagship for the Chinese market. Already, the leak has garnered significant interest because it combines very high battery capacity with fast charging and an industrial design that remains slim, making it a notable step up for the REDMI K Ultra series.
Battery Technology and Charging Strategy
According to the leak, the REDMI K90 Ultra will boast a 10,000mAh battery with 100W wired fast charging and full-power wireless charging. Being able to achieve this capacity in a chassis thinner than 8.5mm suggests that Xiaomi uses a new high-density battery solution combined with advanced internal stacking and thermal management.
DigitalChatStation added in the comments that Xiaomi is rather focusing on daily usability and hand feel over further increasing the thickness of the smartphones. This, in turn, aligns with Xiaomi’s recent design philosophy: finding a balance between endurance, ergonomics, and charging efficiency rather than going forward with raw battery size.
Expected performance and hardware positioning
Besides the battery, the REDMI K90 Ultra will still be a real flagship-level performance device. When he was asked whether this phone will adopt a mid-range Snapdragon or Dimensity chip, the blogger hinted strongly at top of the range chipsets, with no mid-range options, in line with the positioning of previous REDMI K Ultra series.
Based on previous leaks, it could pack:
- MediaTek Dimensity 9-series
- Large flat LTPS display around 6.8 inches
- 1.5K resolution with up to 165Hz refresh rate
- Metal frame construction
- Ultrasonic in-display fingerprint sensor
- Comprehensive water and dust resistance
These specifications would suggest that Xiaomi is firm about keeping the K90 Ultra to the flagships in terms of performance, rather than a reshuffling of those specifications into some kind of battery-centric compromise device.
Position of REDMI K90 series.
Ultra, on its part, within the REDMI K90 series, is believed to sit just below the Pro Max variant, yet still with very competitive specifications. Information till date indicates that the REDMI K90 Pro Max carries the Snapdragon 8 Elite platform, a dedicated graphics chip, and a high-end OLED display with advanced pixel architecture.
The REDMI K90 Ultra will be sold exclusively in China, like all its predecessors. It is expected to have a global outing later under the branding of Xiaomi T series, which continues with Xiaomi’s market strategy.
Strategic implications for Xiaomi
If these details are confirmed, the REDMI K90 Ultra would represent a major milestone in battery engineering for slim flagship smartphones. Putting together such a large 10,000mAh battery with fast wired and wireless charging in a thin body really shows continued investment by Xiaomi in the fields of material science, power management, and long-term usability.
Such a device would better reinforce Xiaomi’s position in the performance flagship group of customers who would not want to compromise on battery longevity with premium design standards.
